UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-04077 Name of Fund: BlackRock U.S. Government Fund Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer, BlackRock U.S. Government Fund, 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (609) 282-2800 Date of fiscal year end: 08/31/06 Date of reporting period: 09/01/05 - 08/31/06 Item 1 - Report to Stockholders ALTERNATIVES BLACKROCK SOLUTIONS EQUITIES FIXED INCOME LIQUIDITY REAL ESTATE BlackRock U.S. Government Fund ANNUAL REPORT AUGUST 31, 2006 (BLACKROCK logo) NOT FDIC INSURED MAY LOSE VALUE NO BANK GUARANTEE This report is not authorized for use as an offer of sale or a solicitation of an offer to buy shares of the Fund unless accompanied or preceded by the Fund's current prospectus. Past performance results shown in this report should not be considered a representation of future performance. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Statements and other information herein are as dated and are subject to change. A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities is available (1) without charge, upon request, by calling toll-free 1-800-441-7762; (2) at www.blackrock.com; and (3) on the Securities and Exchange Commission's Web site at http://www.sec.gov. Information about how the Fund voted proxies relating to securities held in the Fund's portfolio during the most recent 12-month period ended June 30 is available (1) at www.blackrock.com and (2) on the Securities and Exchange Commission's Web site at http://www.sec.gov. BlackRock U.S. Government Fund Box 9011 Princeton, NJ 08543-9011 (GO PAPERLESS...logo) It's Fast, Convenient, & Timely! To sign up today, go to www.blackrock.com/edelivery. BlackRock U.S. Government Fund Portfolio Information as of August 31, 2006 Percent of Total Asset Mix Investments U.S. Government Agency Mortgage-Backed Obligations 38.9% U.S. Government Agency Mortgage-Backed Obligations--Collateralized Mortgage Obligations 25.9 U.S. Government & Agency Obligations 15.0 Non-U.S. Government Agency Mortgage- Backed Obligations--Collateralized Mortgage Obligations 11.3 Other* 8.9 * Includes portfolio holdings in short-term investments and options. Proxy Results During the six-month period ended August 31, 2006, BlackRock U.S. Government Fund's shareholders voted on the following proposals. Proposals 1 and 3 were approved at a shareholders' meeting on August 31, 2006. A description of the proposals and number of shares voted were as follows: Shares Voted Shares Voted Shares Voted For Against Abstain 1. To approve a new investment advisory agreement. 77,940,093 2,197,591 2,114,710 3. To approve a contingent subadvisory agreement. 77,754,360 2,271,411 2,226,623 BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 A Letter to Shareholders Dear Shareholder It is my pleasure to welcome you to BlackRock. On September 29, 2006, BlackRock, Inc. ("BlackRock") and Merrill Lynch Investment Managers, L.P. ("MLIM") united to form one of the largest asset management firms in the world. Now with more than $1 trillion in assets under management, over 4,000 employees in 18 countries and representation in key markets worldwide, BlackRock's global presence means greater depth and scale to serve you. The new BlackRock unites some of the finest money managers in the industry. Our ranks include more than 500 investment professionals globally - portfolio managers, research analysts, risk management professionals and traders. With offices strategically located around the world, our investment professionals have in-depth local knowledge and the ability to leverage our global presence and robust infrastructure to deliver focused investment solutions. BlackRock's professional investors are supported by disciplined investment processes and best-in-class technology, ensuring that our portfolio managers are well equipped to research, uncover and capitalize on the opportunities the world's markets have to offer. The BlackRock culture emphasizes excellence, teamwork and integrity in the management of a variety of equity, fixed income, cash management, alternative investment and real estate products. Our firm's core philosophy is grounded in the belief that experienced investment and risk professionals using disciplined investment processes and sophisticated analytical tools can consistently add value to client portfolios. As you probably are aware, former MLIM investment products now carry the "BlackRock" name. This is reflected in newspapers and online fund reporting resources. Your account statements will reflect the BlackRock name beginning with the October month-end reporting period. Unless otherwise communicated to you, your funds maintain the same investment objectives that they did prior to the combination of MLIM and BlackRock. Importantly, this union does not affect your brokerage account or your relationship with your financial advisor. Clients of Merrill Lynch remain clients of Merrill Lynch. We view this combination of asset management leaders as a complementary union that reinforces our commitment to shareholders. Individually, each firm made investment performance its single most important mission. Together, we are even better prepared to capitalize on market opportunities on behalf of our shareholders. Our focus on investment excellence is accompanied by an unwavering commitment to service, enabling us to assist clients, in cooperation with their financial professionals, in working toward their investment goals. We thank you for allowing us the opportunity, and we look forward to serving your investment needs in the months and years ahead as the new BlackRock. Sincerely, (Robert C. Doll, Jr.) Robert C. Doll, Jr. Vice Chairman BlackRock, Inc. Data, including assets under management, are as of June 30, 2006. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 A Discussion With Your Fund's Portfolio Managers We continued to focus on providing a competitive yield while also seeking to enhance the overall structure of the portfolio and protect the Fund's value amid rising interest rates. How did the Fund perform during the fiscal year in light of the existing market conditions? For the 12-month period ended August 31, 2006, Merrill Lynch U.S. Government Fund's Class A, Class B, Class C, Class I and Class R Shares had total returns of +1.13%, +0.61%, +0.65%, +1.38% and +0.98%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 6 and 7 of this report to shareholders.) For the same period, the benchmark Citigroup Government/Mortgage Index returned +1.99% and the Lipper Intermediate U.S. Government Funds category provided an average return of +1.34%. (Funds in this Lipper category invest at least 65% of their assets in securities issued or guaranteed by the U.S. government, its agencies or its instrumentalities, with dollar-weighted average maturities of five to 10 years.) The Federal Reserve Board (the Fed) advanced its monetary tightening campaign with seven quarter-point interest rate hikes during the past year, before pausing on August 8. This brought the target federal funds rate to 5.25% at period-end. Over the course of the 12 months, interest rates rose all along the curve, with the two-year Treasury yield increasing 95 basis points (0.95%) to 4.79% and the 10-year Treasury yield increasing 72 basis points to 4.74%. The yield curve, which had flattened considerably since the Fed began increasing interest rates in 2004, has toyed with bouts of inversion since the start of 2006, with short-term issues intermittently providing higher yields than long-term issues. At period-end, the one-month Treasury was offering the highest yield on the curve, at 5.12%, while the 30-year Treasury yield stood at 4.88%. Because bond prices move in the opposite direction of yields, it was a fairly challenging period for fixed income investment. What factors most influenced Fund performance? The Fund traditionally has had an above-average position in agency commercial mortgage product relative to its peers. Our exposure to this area of the market performed well, particularly since the start of 2006, providing an excess return over Treasury issues of 69 basis points year-to-date. However, some of that benefit was offset by the Fund's duration profile (a measure of interest rate sensitivity). For much of the period, we had positioned the Fund with a slightly short duration in anticipation of a more aggressive Fed and higher interest rates going forward. Although interest rates did rise year- over-year as anticipated, they also fell at times when the Fed began to soften its stance on inflation and expectations for future rate hikes declined. As new Fed Chairman Ben Bernanke sought to establish credibility with the markets, his statements often resulted in uncertainty regarding the direction of interest rates. We monitored and actively adjusted the Fund's duration profile throughout the year based on our expectation of interest rate direction, with some success. However, amid the uncertain Fed rhetoric, we also found ourselves with incorrect duration biases at times, and this ultimately detracted from performance. Contributing positively to performance was our sector rotation out of Treasury securities and into agency debentures and AAA-rated commercial mortgage-backed securities (CMBS). We made this move when CMBS cheapened to attractive levels compared to Treasury issues, and sold some of our exposure when CMBS prices became expensive. This, coupled with our residential mortgage exposure, worked out well. Residential mortgages performed extremely well in the new year following a volatile period of underperformance in mid-to-late 2005. Also additive to the Fund's yield were asset-backed securities (ABS), which were used as cash equivalent alternatives against forward commitments (agreements to buy or sell securities at a specified price with settlement to occur at a specific future date). What changes were made to the portfolio during the period? As discussed in our last report to shareholders, the largest change in the portfolio over the course of the past year has been a move away from residential mortgage pass-through securities in favor of collateralized mortgage obligations (CMOs) and hybrid adjustable rate mortgages (ARMs). This was largely a defensive move aimed at positioning the portfolio for rising interest rates, mortgage duration extension and a resteepening of the yield curve as the Fed approached the end of its two-year rate-hiking campaign. These structured securities offered capital appreciation potential and better prepayment protection than the straight residential mortgage market. CMOs, for example, are pools of mortgages structured to provide a certain cash flow based on the prepayment speeds of the underlying mortgages. We were able to purchase both CMOs and hybrid ARMs at relatively inexpensive levels, and both appreciated in price during the period. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Other notable portfolio activity included an increased dependence on sector rotation within the portfolio. Last year we had a relatively heavy weighting in agency commercial mortgage-backed securities, a core position we established in an effort to generate additional yield in the portfolio. This performed as anticipated, adding 20 basis points in overall yield. In the last six months of the year, we reduced that core position significantly in favor of a more tactical sector rotation strategy. This involved shifting in and out of CMBS, agency debentures and residential mortgages as attractive opportunities presented themselves in the form of spread widening. Finally, in August, the Fed opted to pause in its interest rate-hiking program and the 10-year Treasury yield fell to its lowest level since March. We viewed this as a catalyst for spreads to tighten in the near-term and took the opportunity to increase our overall exposure to spread sectors. As such, we added residential mortgages, commercial mortgages and agency debentures across the board to increase the Fund's overweighting in these sectors, while simultaneously selling comparable duration Treasury issues. How would you characterize the Fund's position at the close of the period? We believe the Fed's monetary tightening activity is near its end, as prospects for inflation have dwindled and the economy appears to be slowing, led by a deceleration in the residential housing market. With that, we expect that interest rates will be fairly range-bound and that opportunities to enhance returns will reside more in sector rotation rather than duration positioning. As such, we will look to keep the Fund's duration fairly close to neutral versus the benchmark and continue to allocate assets away from the government sector in favor of high-quality spread sectors, where we see greater value. As investors begin to anticipate a Fed ease (that is, interest rate cut), we would look to position the portfolio with more of a yield curve steepening bias. Historically, the Treasury curve begins to resteepen within six months of the Fed's final tightening move. At period-end, the Fund continued to favor CMOs and hybrid ARMs over residential mortgages. Both of these security types offer exposure to the mortgage market but with more protection in the event that interest rates do continue to rise. The portfolio also was modestly overweight in spread product, with the majority of that exposure in the front end of the yield curve. Within that allocation to spread product, the Fund was underweight to agency debentures and overweight in AAA-rated CMBS. Frank Viola Vice President and Co-Portfolio Manager Thomas Musmanno Vice President and Co-Portfolio Manager Laura Powers Vice President and Co-Portfolio Manager September 13, 2006 Effective October 2, 2006, the Fund's Class A, Class B, Class C and Class I Shares were redesignated Investor A, Investor B, Investor C and Institutional Shares, respectively. Class R Shares remain the same. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Performance Data About Fund Performance The Fund has multiple share classes: * Class A Shares incur a maximum initial sales charge (front-end load) of 4% and an account maintenance fee of 0.25% per year (but no distribution fee). * Class B Shares are subject to a maximum contingent deferred sales charge of 4%, declining to 0% after six years. All Class B Shares purchased prior to December 1, 2002 will maintain the four-year schedule. In addition, Class B Shares are subject to a distribution fee of 0.50% per year and an account maintenance fee of 0.25% per year. These shares automatically convert to Class A Shares after approximately ten years. (There is no initial sales charge for automatic share conversions.) * Class C Shares are subject to a distribution fee of 0.55% per year and an account maintenance fee of 0.25% per year. In addition, Class C Shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. * Class I Shares are not subject to any front-end sales charge. Class I Shares bear no ongoing distribution or account maintenance fees and are available only to eligible investors. * Class R Shares do not incur a maximum sales charge (front-end load) or deferred sales charge. These shares are subject to a distribution fee of 0.25% per year and an account maintenance fee of 0.25% per year. Class R Shares are available only to certain retirement plans. Prior to inception, Class R Share performance results are those of Class I Shares (which have no distribution or account maintenance fees) restated for Class R Share fees. None of the past results shown should be considered a representation of future performance. Current performance may be lower or higher than the performance data quoted. Refer to www.blackrock.com to obtain performance data current to the most recent month-end. Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. Figures shown in each of the following tables assume reinvestment of all dividends and capital gain distributions, if any, at net asset value on the payable date. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Dividends paid to each class of shares will vary because of the different levels of account maintenance, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders. Recent Performance Results 6-Month 12-Month 10-Year Standardized As of August 31, 2006 Total Return Total Return Total Return 30-Day Yield Class A Shares* +1.50% +1.13% +70.11% 4.13% Class B Shares* +1.23 +0.61 +61.54 3.78 Class C Shares* +1.21 +0.65 +60.73 3.72 Class I Shares* +1.53 +1.38 +74.40 4.55 Class R Shares* +1.37 +0.98 +66.81 4.05 Citigroup Government/Mortgage Index** +1.87 +1.99 +85.52 -- * Investment results shown do not reflect sales charges; results shown would be lower if a sales charge was included. Cumulative total investment returns are based on changes in net asset values for the periods shown, and assume reinvestment of all dividends and capital gains distributions at net asset value on the payable date. ** This unmanaged Index is a subset of the Citigroup U.S. Broad Investment Grade (USBIG) Index, tracking the performance of the U.S. Treasury/government-sponsored component (fixed rate issues with a maturity of one year or longer) and the mortgage component (15- and 30-year mortgages) of the USBIG. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Performance Data (concluded) Total Return Based on a $10,000 Investment A line graph illustrating the growth of a $10,000 investment in Class A, Class B, Class C, Class I and Class R Shares*++ compared to a similar investment in Citigroup Government/Mortgage Index++++. Values illustrated are as follows: Class A Shares*++ Date Value August 1996 $ 9,600.00 August 1997 $10,493.00 August 1998 $11,317.00 August 1999 $11,428.00 August 2000 $12,237.00 August 2001 $13,636.00 August 2002 $14,668.00 August 2003 $14,952.00 August 2004 $15,645.00 August 2005 $16,148.00 August 2006 $16,331.00 Class B Shares*++ Date Value August 1996 $10,000.00 August 1997 $10,873.00 August 1998 $11,667.00 August 1999 $11,721.00 August 2000 $12,486.00 August 2001 $13,842.00 August 2002 $14,813.00 August 2003 $15,022.00 August 2004 $15,637.00 August 2005 $16,056.00 August 2006 $16,154.00 Class C Shares*++ Date Value August 1996 $10,000.00 August 1997 $10,868.00 August 1998 $11,656.00 August 1999 $11,704.00 August 2000 $12,462.00 August 2001 $13,809.00 August 2002 $14,771.00 August 2003 $14,971.00 August 2004 $15,576.00 August 2005 $15,969.00 August 2006 $16,073.00 Class I Shares*++ Date Value August 1996 $10,000.00 August 1997 $10,968.00 August 1998 $11,859.00 August 1999 $12,006.00 August 2000 $12,874.00 August 2001 $14,382.00 August 2002 $15,524.00 August 2003 $15,848.00 August 2004 $16,624.00 August 2005 $17,202.00 August 2006 $17,440.00 Class R Shares*++ Date Value August 1996 $10,000.00 August 1997 $10,914.00 August 1998 $11,742.00 August 1999 $11,828.00 August 2000 $12,620.00 August 2001 $14,029.00 August 2002 $15,068.00 August 2003 $15,376.00 August 2004 $16,045.00 August 2005 $16,520.00 August 2006 $16,681.00 Citigroup Government/Mortgage Index++++ Date Value August 1996 $10,000.00 August 1997 $10,973.00 August 1998 $12,166.00 August 1999 $12,264.00 August 2000 $13,233.00 August 2001 $14,786.00 August 2002 $16,097.00 August 2003 $16,542.00 August 2004 $17,484.00 August 2005 $18,190.00 August 2006 $18,552.00 * Assuming maximum sales charge, transaction costs and other operating expenses, including advisory fees. ++ The Fund invests at least 80% of its assets in U.S. government and U.S. government agency securities, including GNMA mortgage-backed certificates and other mortgage-backed government securities. ++++ This unmanaged Index is a subset of the Citigroup U.S. Broad Investment Grade (USBIG) Index, tracking the performance of the U.S. Treasury/ government sponsored component (fixed rate issues with a maturity of one year or longer) and the mortgage component (15-year and 30-year mortgages) of USBIG. Past performance is not indicative of future results. Average Annual Total Return Return Without Return With Sales Charge Sales Charge** Class A Shares* One Year Ended 8/31/06 +1.13% -2.91% Five Years Ended 8/31/06 +3.67 +2.83 Ten Years Ended 8/31/06 +5.46 +5.03 Return Without Return With CDSC CDSC++++++ Class B Shares++ One Year Ended 8/31/06 +0.61% -3.26% Five Years Ended 8/31/06 +3.14 +2.78 Ten Years Ended 8/31/06 +4.91 +4.91 Return Without Return With CDSC CDSC++++++ Class C Shares++++ One Year Ended 8/31/06 +0.65% -0.32% Five Years Ended 8/31/06 +3.08 +3.08 Ten Years Ended 8/31/06 +4.86 +4.86 Class I Shares Return One Year Ended 8/31/06 +1.38% Five Years Ended 8/31/06 +3.93 Ten Years Ended 8/31/06 +5.72 Class R Shares Return One Year Ended 8/31/06 +0.98% Five Years Ended 8/31/06 +3.52 Ten Years Ended 8/31/06 +5.25 * Maximum sales charge is 4%. ** Assuming maximum sales charge. ++ Maximum contingent deferred sales charge is 4% and is reduced to 0% after six years. ++++ Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ++++++ Assuming payment of applicable contingent deferred sales charge. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Disclosure of Expenses Shareholders of this Fund may incur the following charges: (a) expenses related to transactions, including sales charges, redemption fees and exchange fees; and (b) operating expenses including advisory fees, distribution fees including 12b-1 fees, and other Fund expenses. The following example (which is based on a hypothetical investment of $1,000 invested on March 1, 2006 and held through August 31, 2006) is intended to assist shareholders both in calculating expenses based on an investment in the Fund and in comparing these expenses with similar costs of investing in other mutual funds. The first table below provides information about actual account values and actual expenses. In order to estimate the expenses a shareholder paid during the period covered by this report, shareholders can divide their account value by $1,000 and then multiply the result by the number in the first line under the heading entitled "Expenses Paid During the Period." The second table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses. In order to assist shareholders in comparing the ongoing expenses of investing in this Fund and other funds, compare the 5% hypothetical example with the 5% hypothetical examples that appear in other funds' shareholder reports. The expenses shown in the table are intended to highlight shareholders' ongoing costs only and do not reflect any transactional expenses, such as sales charges, redemption fees or exchange fees. Therefore, the second table is useful in comparing ongoing expenses only, and will not help shareholders determine the relative total expenses of owning different funds. If these transactional expenses were included, shareholder expenses would have been higher. Expenses Paid Beginning Ending During the Period* Account Value Account Value March 1, 2006 March 1, August 31, to August 31, 2006 2006 2006 Actual Class A $1,000 $1,015.00 $ 8.99 Class B $1,000 $1,012.30 $11.77 Class C $1,000 $1,012.10 $11.97 Class I $1,000 $1,015.30 $ 7.72 Class R $1,000 $1,013.70 $10.15 Hypothetical (5% annual return before expenses)** Class A $1,000 $1,016.28 $ 9.00 Class B $1,000 $1,013.50 $11.77 Class C $1,000 $1,013.30 $11.98 Class I $1,000 $1,017.54 $ 7.73 Class R $1,000 $1,015.12 $10.16 * For each class of the Fund, expenses are equal to the annualized expense ratio for the class (1.77% for Class A, 2.32% for Class B, 2.36% for Class C, 1.52% for Class I and 2.00% for Class R), multiplied by the average account value over the period, multiplied by 184/365 (to reflect the one-half year period shown). ** Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 365. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Schedule of Investments Face Interest Maturity Issue Amount Rate Date(s) Value U.S. Government & Agency Obligations--17.0% Fannie Mae $ 7,500,000 4.25 % 5/15/2009 $ 7,356,293 39,200,000 6.625 9/15/2009 40,962,079 18,625,000 7.25 1/15/2010 19,898,745 Federal Farm Credit Bank 15,500,000 4.55 6/08/2020 14,472,273 Federal Home Loan Bank System 25,000,000 4.375 9/17/2010 (d) 24,398,375 U.S. Treasury Bonds 11,000,000 6.875 8/15/2025 13,576,409 22,200,000 7.125 2/15/2023 (d) 27,562,676 15,000,000 7.625 2/15/2025 19,798,830 7,502,000 8.125 8/15/2019 9,807,110 U.S. Treasury Notes 6,500,000 3.375 2/28/2007 6,445,413 25,000,000 4.50 2/15/2009 (d) 24,857,425 42,500,000 4.50 11/15/2010 (d) 42,189,538 Total U.S. Government & Agency Obligations (Cost--$256,800,532)--17.0% 251,325,166 U.S. Government Agency Mortgage-Backed Obligations*--43.9% Fannie Mae Guaranteed Pass-Through Certificates 5,089,064 4.28 2/01/2010 4,936,211 25,558,509 4.85 (1) 9/01/2035 25,155,794 18,000,000 4.94 12/01/2012 17,761,072 31,548,427 4.954 (1) 9/01/2035 30,903,511 870,241 5.00 11/01/2019 853,499 676,839 5.00 8/01/2035 648,636 39,220,000 5.10 2/01/2013 38,767,182 9,730,302 5.50 3/01/2021 9,695,524 77,138,268 5.50 (2) 12/01/2034 - 9/15/2036 75,708,968 19,988,096 5.826 (1) 7/01/2036 19,912,028 2,365,759 6.50 12/01/2008 - 2/01/2014 2,403,308 15,144,477 6.50 3/01/2033 - 1/01/2036 15,388,765 4,782,748 7.50 7/01/2016 - 12/01/2032 4,953,702 19,415 8.00 9/01/2024 - 9/01/2027 20,585 935,372 8.50 8/01/2012 - 7/15/2023 1,004,398 308,086 11.00 2/01/2011 - 8/01/2020 338,389 223,451 13.00 9/01/2013 - 3/01/2015 249,613 Freddie Mac Mortgage Participation Certificates 30,374,252 4.50 9/01/2020 - 2/01/2021 29,170,194 16,348,864 5.00 1/01/2019 - 6/01/2019 16,037,001 42,461,559 5.00 7/01/2035 - 2/01/2036 40,732,922 15,293,388 5.005 (1) 10/01/2035 14,925,391 23,307,562 5.50 3/01/2016 - 1/01/2021 23,233,876 15,936,000 5.50 (2) 9/15/2036 15,647,160 22,964,982 6.00 10/01/2009 - 10/01/2020 23,170,991 20,908,720 6.00 5/01/2029 - 3/01/2035 21,008,219 11,283,808 6.50 8/01/2029 - 4/01/2036 11,477,979 1,133,892 7.00 4/01/2032 1,167,088 820,329 7.50 5/01/2009 - 10/01/2011 842,398 13,192,531 7.50 8/01/2017 - 12/01/2032 13,671,601 770,343 8.00 1/01/2008 - 7/01/2012 792,939 1,337,928 8.00 10/01/2027 - 8/01/2032 1,408,237 273,158 8.50 1/01/2025 - 7/01/2025 293,442 275 10.00 7/01/2019 300 150,872 11.00 4/01/2012 - 9/01/2020 165,982 148,546 11.50 7/01/2013 - 6/01/2020 160,524 133,250 12.00 6/01/2013 - 6/01/2020 147,350 180,892 12.50 12/01/2015 - 7/01/2019 194,842 257,616 13.00 9/01/2010 - 2/01/2016 284,883 BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Schedule of Investments (continued) Face Interest Maturity Issue Amount Rate Date(s) Value U.S. Government Agency Mortgage-Backed Obligations* (concluded) Ginnie Mae MBS Certificates $ 40,983,713 5.00 % 12/15/2034 - 1/15/2035 $ 39,732,172 9,630,900 5.10 10/15/2007 - 12/01/2015 9,448,298 12,527,200 5.11 8/01/2045 - 1/15/2047 12,010,753 20,205,877 5.50 1/15/2007 - 11/30/2045 20,412,256 2,383,700 5.65 5/15/2007 2,431,970 7,846,700 5.70 3/01/2015 - 8/15/2046 7,883,564 49,061,300 5.80 4/15/2046 50,566,010 1,884,119 6.00 5/15/2024 - 11/15/2031 1,904,771 34,553,684 6.09 10/15/2008 36,338,727 3,395,497 7.00 4/15/2023 - 4/15/2032 3,503,498 3,922,765 7.50 2/15/2025 - 12/15/2031 4,086,050 4,239 10.50 1/15/2016 4,694 52 11.00 1/15/2016 58 Total U.S. Government Agency Mortgage-Backed Obligations (Cost--$657,894,742)--43.9% 651,557,325 U.S. Government Agency Mortgage-Backed Obligations*--Collateralized Mortgage Obligations--29.3% Fannie Mae Trust 1998-M1-IO2 23,354,719 0.686 (1)(3) 2/25/2013 345,918 2003-28-TB 4,956,351 5.00 8/25/2022 4,851,891 2004-T9-A1 10,727,943 5.494 (1) 4/25/2035 10,734,809 2005-25-PD 13,934,000 5.50 11/25/2030 13,777,680 2005-36-CD 18,300,000 5.50 11/25/2031 18,114,939 2005-103-AT 17,789,584 5.50 6/25/2024 17,784,074 2006-18-PC 10,000,000 5.50 1/25/2032 9,858,480 2006-58-DA 16,494,590 5.50 9/25/2025 16,495,027 2003-41-YF 14,674,253 5.624 (1) 6/25/2028 14,698,183 2004-29-FW 5,669,863 5.624 (1) 12/25/2017 5,681,263 2004-61-TF 15,738,239 5.724 (1) 10/25/2031 15,847,982 2006-37-DB 17,000,000 6.00 4/25/2035 17,090,262 273-2 211,546 7.00 (3) 7/1/2026 47,188 1997-M8-A2 217,112 7.16 1/25/2022 216,772 1996-W1-AL 983,975 7.25 3/25/2026 1,011,798 Freddie Mac Multi-Class Certificates SF4-B 3,401,249 2.37 12/15/2009 3,305,823 2618-PT 15,000,000 4.50 10/15/2031 13,924,833 2957-KN 19,121,000 5.50 6/15/2030 18,937,022 2958-MD 15,000,000 5.50 1/15/2031 14,853,167 2963-DL 9,214,000 5.50 2/15/2031 9,106,431 3081-CP 9,000,000 5.50 10/15/2034 8,798,702 2643-OF 23,166,823 5.68 (1) 7/15/2028 23,217,030 1220-A 344,277 5.725 (1) 2/15/2022 344,285 3136-PD 9,000,000 6.00 12/15/2034 9,091,103 3173-PE 16,365,000 6.00 4/15/2035 16,518,430 1220-B 2,799 536.00 (1)(3) 2/15/2022 33,588 Ginnie Mae Trust 2005-9-IO 135,626,843 0.778 (1)(3) 1/16/2045 7,176,681 2006-5-IO 132,932,435 0.797 (1)(3) 1/16/2046 7,353,769 2006-30-IO 50,949,770 0.80 (1)(3) 5/16/2046 3,009,221 2005-90-IO 134,862,284 0.912 (1)(3) 11/16/2045 7,390,521 2006-15-IO 140,489,938 0.916 (1)(3) 4/16/2046 7,372,814 2005-50-IO 34,545,106 1.012 (1)(3) 6/16/2045 2,249,239 2004-10-IO 57,404,856 1.033 (1)(3) 1/16/2044 2,551,715 2004-77-IO 158,339,945 1.065 (1)(3) 9/16/2044 7,730,394 2003-109-B 38,172,095 3.225 9/16/2021 36,756,090 2004-103-A 7,346,273 3.878 12/16/2019 7,168,639 2005-29-Z 4,761,887 4.25 (1) 4/16/2045 3,663,566 2004-97-C 8,400,000 4.522 (1) 2/16/2028 8,009,506 2005-9-Z 5,360,478 4.65 (1) 1/16/2045 4,532,437 2005-12-C 20,000,000 4.658 12/16/2030 19,198,508 2005-67-Z 5,742,860 4.723 (1) 8/16/2045 4,769,938 2005-59-B 10,000,000 4.816 (1) 10/16/2029 9,743,545 BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Schedule of Investments (continued) Face Interest Maturity Issue Amount Rate Date(s) Value U.S. Government Agency Mortgage-Backed Obligations*--Collateralized Mortgage Obligations (concluded) Ginnie Mae Trust 2005-59-ZA $ 9,096,101 4.959 %(1) 3/16/2046 $ 7,980,145 (concluded) 2005-10-ZB 2,972,081 5.175 (1) 12/16/2044 2,732,041 2001-58-C 20,000,000 5.494 (1) 8/16/2027 20,037,888 Total U.S. Government Agency Mortgage-Backed Obligations--Collateralized Mortgage Obligations (Cost--$439,474,009)--29.3% 434,113,337 Face Amount Issue Non-U.S. Government Agency Mortgage-Backed Obligations*--Collateralized Mortgage Obligations--12.7% $ 11,250,000 Ameriquest Mortgage Securities, Inc. Series 2004-IA1 Class M1, 6.124% due 9/25/2034 (1) 11,302,856 7,055,000 Banc of America Alternative Loan Trust Series 2005-10 Class 1CB3, 5.50% due 11/25/2035 6,839,784 11,836,649 CS First Boston Mortage Securities Corp. Series 2005-11 Class 6A5, 6% due 12/25/2035 11,915,739 396,847 Centex Home Equity Series 2004-B Class AV1, 5.524% due 3/25/2034 (1) 396,872 14,045,400 Citimortgage Alternative Loan Trust Series 2006-A2 Class A2, 6% due 5/25/2036 14,093,576 4,681,520 Countrywide Home Equity Loan Trust Series 2004-K Class 2A, 5.63% due 2/15/2034 (1) 4,690,939 16,150,000 Credit Suisse Mortgage Capital Certificates Series 2006-C3 Class A3, 6.022% due 6/15/2038 (1) 16,638,027 8,500,000 Greenwich Capital Commercial Funding Corp. Series 2006-GG7 Class A4, 6.11% due 7/10/2038 (1) 8,820,315 JPMorgan Chase Commercial Mortgage Securities Corp. (1): 16,500,000 Series 2006-CB15 Class A4, 5.814% due 6/12/2043 16,906,276 13,000,000 Series 2006-LDP7 Class A4, 6.066% due 4/15/2045 13,457,868 20,854,377 JPMorgan Mortgage Trust Series 2005-A2 Class 4A1, 5.209% due 4/25/2035 (1) 20,323,320 8,800,000 Master Asset Securitization Trust Series 2003-9 Class 2A8, 5.50% due 10/25/2033 8,512,935 6,408,779 Residential Asset Mortgage Products, Inc. Series 2004-RS9 Class AII2, 5.664% due 5/25/2034 (1) 6,425,365 Residential Funding Mortgage Security I: 9,500,000 Series 2006-S1 Class 1A5, 5.25% due 1/25/2036 9,395,812 11,712,000 Series 2006-S3 Class A2, 5.50% due 3/25/2036 11,284,106 759,169 Securitized Asset-Backed Receivables LLC Trust Series 2004-OP1 Class A2, 5.574% due 2/25/2034 (1) 759,165 4,714,444 Washington Mutual Series 2004-AR12 Class A3, 5.698% due 10/25/2044 (1) 4,729,831 6,747,201 Wells Fargo Home Equity Trust Series 2004-2 Class A32, 5.664% due 2/25/2032 (1) 6,759,064 15,639,182 Wells Fargo Mortgage-Backed Securities Trust Series 2005-13 Class A1, 5% due 11/25/2020 15,402,127 Total Non-U.S. Government Agency Mortgage-Backed Obligations--Collateralized Mortgage Obligations (Cost--$185,741,112)--12.7% 188,653,977 Short-Term Securities Repurchase Agreement 32,100,000 Credit Suisse LLC, purchased on 8/31/2006 to yield 5.28% to 9/01/2006, repurchase price of $32,104,708 collateralized by FHLMC 7.087% due 7/01/2033 and FNMA 6.125% due 8/01/2036 32,100,000 Beneficial Interest $ 77,223 Merrill Lynch Liquidity Series, LLC Cash Sweep Series I, 5.11% (a)(b) 77,223 116,607,500 Merrill Lynch Liquidity Series, LLC Money Market Series, 5.33% (a)(b)(c) 116,607,500 Total Short-Term Securities (Cost--$148,784,723)--10.0% 148,784,723 Total Investments (Cost--$1,688,695,118)--112.9% 1,674,434,528 Number of Contracts Put Options Written 1,000 UST BONDS (10 YEAR), expiring November 2006 at USD 103 (31,250) Total Put Options Written (Premiums Received--$199,805)--0.0% (31,250) Total Investments, Net of Options Written (Cost--$1,688,495,313**)--112.9% 1,674,403,278 Liabilities in Excess of Other Assets--(12.9%) (190,810,355) --------------- Net Assets--100.0% $ 1,483,592,923 =============== BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Schedule of Investments (concluded) * Mortgage-Backed Obligations are subject to principal paydowns. As a result of prepayments or refinancings of the underlying instruments, the average life may be substantially less than the original maturity. ** The cost and unrealized appreciation (depreciation) of investments, net of options written, as of August 31, 2006, as computed for federal income tax purposes, were as follows: Aggregate cost $ 1,688,495,313 ================== Gross unrealized appreciation $ 7,825,537 Gross unrealized depreciation (21,917,572) ------------------ Net unrealized depreciation $ (14,092,035) ================== (1) Floating rate security. (2) Represents or includes a "to-be-announced" transaction. The Fund has committed to purchasing securities for which all specific information is not available at this time. (3) Represents the interest only portion of a mortgage-backed obligation. (a) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Net Interest Issue Activity Income Merrill Lynch Liquidity Series, LLC Cash Sweep Series I $ 77,223 $ 29,954 Merrill Lynch Liquidity Series, LLC Money Market Series $90,235,000 $ 89,044 (b) Represents the current yield as of August 31, 2006. (c) Security was purchased with the cash proceeds from securities loans. (d) Security, or a portion of security, is on loan. * Swaps outstanding as of August 31, 2006 were as follows: Unrealized Notional Appreciation Amount (Depreciation) Receive (pay) a variable return based on the change in the since inception return of the Lehman Brothers U.S. Agency Index and pay a floating rate based on 1-month LIBOR minus 0.05% Broker, Lehman Brothers Special Finance Expires October 2006 $25,000,000 -- Receive (pay) a variable return based on the change in the since inception return of the Lehman Brothers U.S. Treasury Index and pay a floating rate based on 1-month LIBOR minus 0.12% Broker, Lehman Brothers Special Finance Expires November 2006 $50,000,000 -- Receive a fixed rate of 5.418% and pay a floating rate based on 3-month LIBOR Broker, UBS Warburg Expires May 2008 $ 9,685,000 $ 27,410 Pay a fixed rate of 5.50% and receive a floating rate based on 3-month LIBOR Broker, UBS Warburg Expires May 2011 $10,000,000 (134,146) Pay a fixed rate of 4.8875% and receive a floating rate based on 3-month LIBOR Broker, JPMorgan Chase Bank Expires December 2014 $93,000,000 2,268,436 Pay a fixed rate of 5.151% and receive a floating rate based on 3-month LIBOR Broker, JPMorgan Chase Bank Expires March 2016 $54,000,000 510,072 Receive a fixed rate of 5.643% and pay a floating rate based on 3-month LIBOR Broker, UBS Warburg Expires May 2016 $ 3,645,000 99,011 ----------- Total $ 2,770,783 =========== See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Statement of Assets and Liabilities As of August 31, 2006 Assets Investments, at value (including securities loaned of $113,291,475) (identified cost--$1,572,010,395) $ 1,557,749,805 Investments in affiliated securities, at value (identified cost--$116,684,723) 116,684,723 Cash on deposit for options written 135,000 Unrealized appreciation on swaps 2,904,929 Receivables: Securities sold $ 9,703,638 Interest 8,266,763 Beneficial interest sold 1,808,786 Swaps 1,361,859 Principal paydowns 241,169 Securities lending 15,548 21,397,763 --------------- Prepaid expenses 9,322 --------------- Total assets 1,698,881,542 --------------- Liabilities Collateral on securities loaned, at value 116,607,500 Options written, at value (premiums received--$199,805) 31,250 Unrealized depreciation on swaps 134,146 Bank overdraft 3,636 Payables: Securities purchased 89,982,949 Beneficial interest redeemed 4,224,759 Dividends to shareholders 1,492,965 Swaps 1,126,232 Investment adviser 482,041 Distributor 455,074 Other affiliates 323,352 98,087,372 --------------- Accrued expenses and other liabilities 424,715 --------------- Total liabilities 215,288,619 --------------- Net Assets Net assets $ 1,483,592,923 =============== Net Assets Consist of Class A Shares of beneficial interest, $.10 par value, unlimited number of shares authorized $ 6,929,910 Class B Shares of beneficial interest, $.10 par value, unlimited number of shares authorized 2,360,544 Class C Shares of beneficial interest, $.10 par value, unlimited number of shares authorized 2,146,963 Class I Shares of beneficial interest, $.10 par value, unlimited number of shares authorized 3,168,818 Class R Shares of beneficial interest, $.10 par value, unlimited number of shares authorized 315,160 Paid-in capital in excess of par 1,508,616,960 Accumulated distributions in excess of investment income--net $ (1,492,965) Accumulated realized losses--net (27,131,215) Unrealized depreciation--net (11,321,252) --------------- Total accumulated losses--net (39,945,432) --------------- Net Assets $ 1,483,592,923 =============== Net Asset Value Class A--Based on net assets of $689,013,888 and 69,299,101 shares of beneficial interest outstanding $ 9.94 =============== Class B--Based on net assets of $234,712,080 and 23,605,439 shares of beneficial interest outstanding $ 9.94 =============== Class C--Based on net assets of $213,450,145 and 21,469,628 shares of beneficial interest outstanding $ 9.94 =============== Class I--Based on net assets of $315,124,947 and 31,688,179 shares of beneficial interest outstanding $ 9.94 =============== Class R--Based on net assets of $31,291,863 and 3,151,604 shares of beneficial interest outstanding $ 9.93 =============== See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Statement of Operations For the Year Ended August 31, 2006 Investment Income Interest (including $29,954 from affiliates) $ 86,776,486 Securities lending--net 89,044 --------------- Total income 86,865,530 --------------- Expenses Interest expense $ 8,459,316 Investment advisory fees 7,347,406 Account maintenance and distribution fees--Class B 2,085,029 Account maintenance and distribution fees--Class C 1,817,516 Account maintenance fees--Class A 1,748,954 Transfer agent fees--Class A 1,708,846 Transfer agent fees--Class I 795,501 Short sale expense 778,515 Transfer agent fees--Class B 738,790 Transfer agent fees--Class C 621,825 Accounting services 418,403 Custodian fees 193,952 Professional fees 164,102 Account maintenance and distribution fees--Class R 129,436 Registration fees 112,552 Printing and shareholder reports 107,030 Transfer agent fees--Class R 65,182 Pricing fees 63,179 Trustees' fees and expenses 53,522 Other 78,857 --------------- Total expenses 27,487,913 --------------- Investment income--net 59,377,617 --------------- Realized & Unrealized Gain (Loss)--Net Realized gain (loss) on: Investments--net (40,410,666) Financial futures contracts and swaps--net 11,520,824 Options written--net (1,421,459) Short sales--net 1,711,389 (28,599,912) --------------- Change in unrealized appreciation/depreciation on: Investments--net (26,451,237) Swaps--net 8,641,898 Options written--net 696,080 (17,113,259) --------------- --------------- Total realized and unrealized loss--net (45,713,171) --------------- Net Increase in Net Assets Resulting from Operations $ 13,664,446 =============== See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Statements of Changes in Net Assets For the Year Ended August 31, Increase (Decrease) in Net Assets: 2006 2005 Operations Investment income--net $ 59,377,617 $ 53,245,250 Realized gain (loss)--net (28,599,912) 25,606,893 Change in unrealized appreciation/depreciation--net (17,113,259) (25,136,802) --------------- --------------- Net increase in net assets resulting from operations 13,664,446 53,715,341 --------------- --------------- Dividends & Distributions to Shareholders Investment income--net: Class A (29,797,210) (27,412,537) Class B (10,341,234) (11,609,588) Class C (8,364,191) (8,117,957) Class I (14,539,807) (13,783,700) Class R (1,049,693) (467,783) Realized gain--net: Class A (897,119) -- Class B (370,126) -- Class C (288,609) -- Class I (413,656) -- Class R (30,543) -- --------------- --------------- Net decrease in net assets resulting from dividends and distributions to shareholders (66,092,188) (61,391,565) --------------- --------------- Beneficial Interest Transactions Net decrease in net assets derived from beneficial interest transactions (168,429,370) (184,361,007) --------------- --------------- Net Assets Total decrease in net assets (220,857,112) (192,037,231) Beginning of year 1,704,450,035 1,896,487,266 --------------- --------------- End of year* $ 1,483,592,923 $ 1,704,450,035 =============== =============== * Undistributed (accumulated distributions in excess of) investment income--net $ (1,492,965) $ 1,278,118 =============== =============== See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Statement of Cash Flows For the Year Ended August 31, 2006 Cash Provided by Operating Activities Net increase in net assets resulting from operations $ 13,664,446 Adjustments to reconcile net increase in net assets resulting from operations to net cash used for operating activities: Increase in receivables (1,969,269) Decrease in prepaid expenses and other assets 152,217 Increase in cash on deposit for options written 135,000 Increase in other liabilities 188,846 Realized and unrealized loss--net 45,713,171 Realized and unrealized gain on financial futures contracts 151,782 Amortization of premium/discount and payups 3,023,766 Proceeds from sales and paydowns of long-term securities 1,850,655,755 Proceeds from short sales 443,255,260 Other investment related transactions 15,229,762 Purchases of long-term securities (1,698,322,707) Cover of short sale investments (461,868,169) Proceeds from sales of short-term investments 27,434,307 Premiums received from options written 7,451,853 Premiums paid on closing options written (9,935,332) --------------- Cash provided by operating activities 234,960,688 --------------- Cash Used for Financing Activities Proceeds from issuance of Beneficial Interest 344,276,800 Cash payments on Beneficial Interest (541,964,905) Cash receipts from borrowings 912,229,724 Cash payments from borrowings (912,229,724) Dividends paid to shareholders (37,318,694) Increase in bank overdraft 3,636 --------------- Cash used for financing activities (235,003,163) --------------- Cash Net decrease in cash (42,475) Cash at beginning of year 42,475 --------------- Cash at end of year -- =============== Cash Flow Information Cash paid for interest $ 8,459,316 =============== Noncash Financing Activities Capital shares issued in reinvestment of dividends and distributions paid to shareholders $ 28,451,292 =============== See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Financial Highlights The following per share data Class A Class B and ratios have been derived from information provided in For the Year Ended August 31, For the Year Ended August 31, the financial statements. 2006 2005 2004 2003 2002 2006 2005 2004 2003 2002 Per Share Operating Performance Net asset value, beginning of year $ 10.27 $ 10.31 $ 10.13 $ 10.25 $ 9.95 $ 10.27 $ 10.31 $ 10.13 $ 10.26 $ 9.95 ---------------------------------------------- ---------------------------------------------- Investment income--net .39++ .32++ .27++ .32 .43 .34++ .26++ .22++ .26 .38 Realized and unrealized gain (loss)--net (.28) .01 .19 (.12) .30 (.29) .01 .19 (.13) .31 ---------------------------------------------- ---------------------------------------------- Total from investment operations .11 .33 .46 .20 .73 .05 .27 .41 .13 .69 ---------------------------------------------- ---------------------------------------------- Less dividends and distributions from: Investment income--net (.43) (.37) (.28) (.32) (.43) (.37) (.31) (.23) (.26) (.38) Realized gain--net (.01) -- -- -- -- (.01) -- -- -- -- ---------------------------------------------- ---------------------------------------------- Total dividends and distributions (.44) (.37) (.28) (.32) (.43) (.38) (.31) (.23) (.26) (.38) ---------------------------------------------- ---------------------------------------------- Net asset value, end of year $ 9.94 $ 10.27 $ 10.31 $ 10.13 $ 10.25 $ 9.94 $ 10.27 $ 10.31 $ 10.13 $ 10.26 ============================================== ============================================== Total Investment Return* Based on net asset value per share 1.13% 3.22% 4.63% 1.93% 7.54% .61% 2.68% 4.09% 1.40% 6.99% ============================================== ============================================== Ratios to Average Net Assets Expenses, excluding interest expense 1.09% 1.01% .98% .95% .97% 1.62% 1.53% 1.50% 1.47% 1.49% ============================================== ============================================== Expenses 1.64% 1.01% .98% .95% .97% 2.16% 1.53% 1.50% 1.47% 1.49% ============================================== ============================================== Investment income--net 3.95% 3.11% 2.65% 3.09% 4.30% 3.46% 2.55% 2.14% 2.58% 3.76% ============================================== ============================================== Supplemental Data Net assets, end of year (in thousands) $ 689,014 $769,309 $798,279 $855,543 $819,410 $234,712 $332,744 $438,679 $591,435 $613,282 ============================================== ============================================== Portfolio turnover 107.39% 336.73% 508.54% 428.59% 426.77% 107.39% 336.73% 508.54% 428.59% 426.77% ============================================== ============================================== * Total investment returns exclude the effects of sales charges. ++ Based on average shares outstanding. See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Financial Highlights (continued) The following per share data Class C Class I and ratios have been derived from information provided in For the Year Ended August 31, For the Year Ended August 31, the financial statements. 2006 2005 2004 2003 2002 2006 2005 2004 2003 2002 Per Share Operating Performance Net asset value, beginning of year $ 10.26 $ 10.31 $ 10.13 $ 10.25 $ 9.95 $ 10.27 $ 10.31 $ 10.13 $ 10.26 $ 9.95 ---------------------------------------------- ---------------------------------------------- Investment income--net .34++ .26++ .21++ .26 .37 .42++ .35++ .29++ .34 .46 Realized and unrealized gain (loss)--net (.28) --+++ .19 (.12) .30 (.29) --+++ .20 (.13) .31 ---------------------------------------------- ---------------------------------------------- Total from investment operations .06 .26 .40 .14 .67 .13 .35 .49 .21 .77 ---------------------------------------------- ---------------------------------------------- Less dividends and distributions from: Investment income--net (.37) (.31) (.22) (.26) (.37) (.45) (.39) (.31) (.34) (.46) Realized gain--net (.01) -- -- -- -- (.01) -- -- -- -- ---------------------------------------------- ---------------------------------------------- Total dividends and distributions (.38) (.31) (.22) (.26) (.37) (.46) (.39) (.31) (.34) (.46) ---------------------------------------------- ---------------------------------------------- Net asset value, end of year $ 9.94 $ 10.26 $ 10.31 $ 10.13 $ 10.25 $ 9.94 $ 10.27 $ 10.31 $ 10.13 $ 10.26 ============================================== ============================================== Total Investment Return* Based on net asset value per share .65% 2.53% 4.03% 1.35% 6.94% 1.38% 3.47% 4.89% 2.08% 7.91% ============================================== ============================================== Ratios to Average Net Assets Expenses, excluding interest expense 1.67% 1.59% 1.55% 1.52% 1.54% .85% .76% .73% .70% .72% ============================================== ============================================== Expenses 2.22% 1.59% 1.55% 1.52% 1.54% 1.40% .76% .73% .70% .72% ============================================== ============================================== Investment income--net 3.38% 2.51% 2.09% 2.52% 3.40% 4.20% 3.38% 2.89% 3.34% 4.53% ============================================== ============================================== Supplemental Data Net assets, end of year (in thousands) $ 213,450 $247,884 $301,532 $414,539 $384,119 $315,125 $334,660 $349,958 $328,408 $296,305 ============================================== ============================================== Portfolio turnover 107.39% 336.73% 508.54% 428.59% 426.77% 107.39% 336.73% 508.54% 428.59% 426.77% ============================================== ============================================== * Total investment returns exclude the effects of sales charges. Effective December 28, 2005, Class I Shares are no longer subject to any front-end sales charge. ++ Based on average shares outstanding. +++ Amount is less than $.01 per share. See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Financial Highlights (concluded) Class R For the Period January 3, 2003++++ to The following per share data and ratios have been derived For the Year Ended August 31, August 31, from information provided in the financial statements. 2006 2005 2004 2003 Per Share Operating Performance Net asset value, beginning of period $ 10.25 $ 10.29 $ 10.12 $ 10.31 ---------- ---------- ---------- ---------- Investment income--net .36++ .31++ .23++ .24 Realized and unrealized gain (loss)--net (.27) (.01) .20 (.19) ---------- ---------- ---------- ---------- Total from investment operations .09 .30 .43 .05 ---------- ---------- ---------- ---------- Less dividends and distributions from: Investment income--net (.40) (.34) (.26) (.24) Realized gain--net (.01) -- -- -- ---------- ---------- ---------- ---------- Total from dividends and distributions (.41) (.34) (.26) (.24) ---------- ---------- ---------- ---------- Net asset value, end of period $ 9.93 $ 10.25 $ 10.29 $ 10.12 ========== ========== ========== ========== Total Investment Return Based on net asset value per share .98% 2.96% 4.34% .44%+++ ========== ========== ========== ========== Ratios to Average Net Assets Expenses, excluding interest expense 1.36% 1.27% 1.21% 1.23%* ========== ========== ========== ========== Expenses 1.91% 1.27% 1.21% 1.23%* ========== ========== ========== ========== Investment income--net 3.65% 2.97% 2.25% 2.81%* ========== ========== ========== ========== Supplemental Data Net assets, end of period (in thousands) $ 31,292 $ 19,854 $ 8,040 $ 77 ========== ========== ========== ========== Portfolio turnover 107.39% 336.73% 508.54% 428.59% ========== ========== ========== ========== * Annualized. ++ Based on average shares outstanding. ++++ Commencement of operations. +++ Aggregate total investment return. See Notes to Financial Statements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements 1. Significant Accounting Policies: On September 29, 2006, Merrill Lynch U.S. Government Fund was renamed BlackRock U.S. Government Fund (the "Fund"). The Fund is registered under the Investment Company Act of 1940, as amended, as a diversified, open-end management investment company. The Fund's financial statements are prepared in conformity with U.S. generally accepted accounting principles which may require the use of management accruals and estimates. Actual results may differ from these estimates. The Fund offers multiple classes of shares. Class A Shares are sold with a front-end sales charge. Shares of Class B and Class C may be subject to a contingent deferred sales charge. Class I Shares are sold only to certain eligible investors. Class R Shares are sold only to certain retirement plans. All classes of shares have identical voting, dividend, liquidation and other rights and the same terms and conditions, except that Class A, Class B, Class C and Class R Shares bear certain expenses related to the account maintenance of such shares, and Class B, Class C and Class R Shares also bear certain expenses related to the distribution of such shares. Each class has exclusive voting rights with respect to matters relating to its account maintenance and distribution expenditures (except that Class B shareholders may vote upon material changes to the Class A distribution plan). Income, expenses (other than expenses attributable to a specific class) and realized and unrealized gains and losses are allocated daily to each class based on its relative net assets. The following is a summary of significant accounting policies followed by the Fund. (a) Valuation of investments--Debt securities are traded primarily in the over- the-counter ("OTC") markets and are valued at the last available bid price in the OTC market or on the basis of values obtained by a pricing service. Pricing services use valuation matrixes that incorporate both dealer-supplied valuations and valuation models. The procedures of the pricing service and its valuations are reviewed by the officers of the Fund under the general direction of the Board of Trustees. Such valuations and procedures will be reviewed periodically by the Board of Trustees of the Fund. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their closing prices as of the close of such exchanges. Options written or purchased are valued at the last sale price in the case of exchange-traded options. In the case of options traded in the OTC market, valuation is the last asked price (options written) or the last bid price (options purchased). Swap agreements are valued based upon quoted fair valuations received daily by the Fund from a pricing service or counterparty. Short-term investments with a remaining maturity of 60 days or less are valued at amortized cost which approximates market value, under which method the investment is valued at cost and any premium or discount is amortized on a straight line basis to maturity. Repurchase agreements are valued at cost plus accrued interest. Investments in open-end investment companies are valued at their net asset value each business day. Securities and other assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of the Board of Trustees of the Fund. Equity securities that are held by the Fund, which are traded on stock exchanges or the Nasdaq National Market are valued at the last sale price or official close price on the exchange, as of the close of business on the day the securities are being valued or, lacking any sales, at the last available bid price for long positions, and at the last available asked price for short positions. In cases where equity securities are traded on more than one exchange, the securities are valued on the exchange designated as the primary market by or under the authority of the Board of Trustees of the Fund. Long positions traded in the OTC market, Nasdaq Small Cap or Bulletin Board are valued at the last available bid price obtained from one or more dealers or pricing services approved by the Board of Trustees of the Fund. Short positions traded in the OTC market are valued at the last available asked price. Valuation of other short-term investment vehicles is generally based on the net asset value of the underlying investment vehicle or amortized cost. Portfolio securities that are traded both in the OTC market and on a stock exchange are valued according to the broadest and most representative market. Generally, trading in foreign securities is substantially completed each day at various times prior to the close of business on the New York Stock Exchange ("NYSE"). The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. Foreign currency exchange rates also are generally determined prior to the close of business on the NYSE. As of October 2, 2006, foreign currency exchange rates will be determined at the close of business on the NYSE. Occasionally, events affecting the values of such securities and such exchange rates may occur between the times at which they are determined and the close of business on the NYSE that may not be reflected in the computation of the Fund's net asset value. If events (for example, a company announcement, market volatility or a natural disaster) occur during such periods that are expected to materially affect the value of such securities, those securities may be valued at their fair value as determined in good faith by the Fund's Board of Trustees or by the Investment Adviser using a pricing service and/or procedures approved by the Fund's Board of Trustees. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (continued) (b) Repurchase agreements--The Fund may invest in U.S. government securities pursuant to repurchase agreements. Under such agreements, the counterparty agrees to repurchase the security at a mutually agreed upon time and price. The Fund takes possession of the underlying securities, marks-to-market such securities and, if necessary, receives additional securities daily to ensure that the contract is fully collateralized. If the counterparty defaults and the fair value of the collateral declines, liquidation of the collateral by the Fund may be delayed or limited. (c) Reverse repurchase agreements--The Fund may enter into reverse repurchase agreements. Under reverse repurchase agreements, the Fund sells securities to the counterparty and agrees to repurchase them at a mutually agreed upon date and price, and may exchange their respective commitments to pay or receive interest. If the counterparty defaults on its obligation, the Fund's ability to receive interest will be delayed or limited. Furthermore, if the Fund does not have sufficient client income to pay its obligation under the reverse repurchase agreement, the Fund would be in default and the counterparty would be able to terminate the repurchase agreement. At the time a portfolio enters into a reverse repurchase agreement, it will establish a segregated account with the custodian containing cash, or cash equivalents of liquid high grade debt securities having a value at least equal to the repurchase price. (d) Derivative financial instruments--The Fund may engage in various portfolio investment strategies both to increase the return of the Fund and to hedge, or protect, its exposure to interest rate movements and movements in the securities markets. Losses may arise due to changes in the value of the contract or if the counterparty does not perform under the contract. * Financial futures contracts--The Fund may purchase or sell financial futures contracts and options on such financial futures contracts. Financial futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Fund deposits and maintains as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. * Options--The Fund may write and purchase call and put options. When the Fund writes an option, an amount equal to the premium received by the Fund is reflected as an asset and an equivalent liability. The amount of the liability is subsequently marked-to-market to reflect the current market value of the option written. When a security is purchased or sold through an exercise of an option, the related premium paid (or received) is added to (or deducted from) the basis of the security acquired or deducted from (or added to) the proceeds of the security sold. When an option expires (or the Fund enters into a closing transaction), the Fund realizes a gain or loss on the option to the extent of the premiums received or paid (or gain or loss to the extent the cost of the closing transaction exceeds the premiums paid or received). Written and purchased options are non-income producing investments. * Swaps--The Fund may enter into swap agreements, which are OTC contracts in which the Fund and a counterparty agree to make periodic net payments on a specified notional amount. The net payments can be made for a set period of time or may be triggered by a predetermined credit event. The net periodic payments may be based on a fixed or variable interest rate; the change in market value of a specified security, basket of securities, or index; or the return generated by a security. These periodic payments received or made by the Fund are recorded in the accompanying Statement of Operations as realized gains or losses, respectively. Gains or losses are realized upon termination of the swap agreements. Swaps are marked-to-market daily and changes in the value are recorded as unrealized appreciation (depreciation). Risks include changes in the returns of the underlying instruments, failure of the counterparties to perform under contracts' terms and the possible lack of liquidity with respect to the swap agreements. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (continued) * Short sales--When a Fund engages in a short sale, an amount equal to the proceeds received by the Fund is reflected as an asset and an equivalent liability. The amount of the liability is subsequently marked-to-market to reflect the market value of the short sale. The Fund maintains a segregated account of securities as collateral for the short sales. The Fund is exposed to market risk based on the amount, if any, that the market value of the stock exceeds the market value of the securities in the segregated account. The Fund is required to repay the counterparty any dividends or interest received on the security sold short. (e) Income taxes--It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Therefore, no federal income tax provision is required. (f) Recent accounting pronouncement--In July 2006, the Financial Accounting Standards Board ("FASB") issued Interpretation No. 48 ("FIN 48") entitled "Accounting for Uncertainty in Income Taxes - an interpretation of FASB Statement No. 109." FIN 48 prescribes the minimum recognition threshold a tax position must meet in connection with accounting for uncertainties in income tax positions taken or expected to be taken by an entity including mutual funds before being measured and recognized in the financial statements. Adoption of FIN 48 is required for fiscal years beginning after December 15, 2006. The impact on the fund's financial statements, if any, is currently being assessed. (g) Security transactions and investment income--Security transactions are recorded on the dates the transactions are entered into (the trade dates). Realized gains and losses on security transactions are determined on the identified cost basis. Dividend income is recorded on the ex-dividend dates. Interest income and extended delivery fees are recognized on the accrual basis. The Fund amortizes all premiums and discounts on debt securities. (h) Prepaid registration fees--Prepaid registration fees are charged to expense as the related shares are issued. (i) Dividends and distributions--Dividends from net investment income are declared daily and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates. (j) Securities lending--The Fund may lend securities to financial institutions that provide cash or securities issued or guaranteed by the U.S. government as collateral, which will be maintained at all times in an amount equal to at least 100% of the current market value of the loaned securities. The market value of the loaned securities is determined at the close of business of the Fund and any additional required collateral is delivered to the Fund on the next business day. Where the Fund receives securities as collateral for the loaned securities, it collects a fee from the borrower. The Fund typically receives the income on the loaned securities but does not receive the income on the collateral. Where the Fund receives cash collateral, it may invest such collateral and retain the amount earned on such investment, net of any amount rebated to the borrower. Loans of securities are terminable at any time and the borrower, after notice, is required to return borrowed securities within five business days. The Fund may pay reasonable finder's, lending agent, administrative and custodial fees in connection with its loans. In the event that the borrower defaults on its obligation to return borrowed securities because of insolvency or for any other reason, the Fund could experience delays and costs in gaining access to the collateral. The Fund also could suffer a loss where the value of the collateral falls below the market value of the borrowed securities, in the event of borrower default or in the event of losses on investments made with cash collateral. (k) Mortgage dollar rolls--The Fund may sell mortgage-backed securities for delivery in the current month and simultaneously contract to repurchase substantially similar (same type, coupon and maturity) securities on a specific future date. (l) Bank overdraft--The Fund recorded a bank overdraft, which resulted from management estimates of available cash. (m) Reclassifications--U.S. generally accepted accounting principles require that certain components of net assets be adjusted to reflect permanent differences between financial and tax reporting. Accordingly, during the current year, $2,191,090 has been reclassified between paid-in capital in excess of par and accumulated distributions in excess of net investment income and $247,655 has been reclassified between accumulated distributions in excess of net investment income and accumulated net realized capital losses as a result of permanent differences attributable to a tax return of capital, swap agreements, accounting for paydowns, and the reclassification of distributions. These reclassifications have no effect on net assets or net asset values per share. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (continued) 2. Investment Advisory Agreement and Transactions with Affiliates: The Fund has entered into an Investment Advisory Agreement with Fund Asset Management, L.P. ("FAM"). The general partner of FAM is Princeton Services, Inc. ("PSI"), an indirect, wholly-owned subsidiary of Merrill Lynch & Co., Inc. ("ML & Co."), which is the limited partner. The Fund has also entered into a Distribution Agreement and Distribution Plans with FAM Distributors, Inc. ("FAMD" or the "Distributor"), which is a wholly owned subsidiary of Merrill Lynch Group, Inc. FAM is responsible for the management of the Fund's portfolio and provides the necessary personnel, facilities, equipment and certain other services necessary to the operations of the Fund. For such services, the Fund pays a monthly fee based upon the average daily value of the Fund's net assets at the following rates: Portion of Average Daily Value of Net Assets: Rate Not exceeding $500 million .500% In excess of $500 million but not exceeding $1 billion .475% In excess of $1 billion but not exceeding $1.5 billion .450% In excess of $1.5 billion but not exceeding $2 billion .425% In excess of $2 billion but not exceeding $2.5 billion .400% In excess of $2.5 billion but not exceeding $3.5 billion .375% In excess of $3.5 billion but not exceeding $5 billion .350% In excess of $5 billion but not exceeding $6.5 billion .325% Exceeding $6.5 billion .300% Pursuant to the Distribution Plans adopted by the Fund in accordance with Rule 12b-1 under the Investment Company Act of 1940, the Fund pays the Distributor ongoing account maintenance and distribution fees. The fees are accrued daily and paid monthly at annual rates based upon the average daily net assets of the shares as follows: Account Maintenance Distribution Fee Fee Class A .25% -- Class B .25% .50% Class C .25% .55% Class R .25% .25% Pursuant to a sub-agreement with the Distributor, Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S"), an affiliate of FAM, also provides account maintenance and distribution services to the Fund. The ongoing account maintenance fee compensates the Distributor and MLPF&S for providing account maintenance services to Class A, Class B, Class C and Class R shareholders. The ongoing distribution fee compensates the Distributor and MLPF&S for providing shareholder and distribution-related services to Class B, Class C and Class R shareholders. For the year ended August 31, 2006, FAMD earned underwriting discounts and direct commissions and MLPF&S earned dealer concessions on sales of the Fund's Class A and Class I Shares as follows: FAMD MLPF&S Class A $ 3,687 $ 30,882 Class I $ 3,106 $ 27,102 For the year ended August 31, 2006, MLPF&S received contingent deferred sales charges of $224,697 and $5,911 relating to transactions in Class B and Class C Shares, respectively. Furthermore, MLPF&S received contingent deferred sales charges of $13 and $839 relating to transactions subject to front-end sales charge waivers in Class A and Class I Shares, respectively. The Fund has received an exemptive order from the Securities and Exchange Commission permitting it to lend portfolio securities to MLPF&S or its affiliates. Pursuant to that order, the Fund also has retained Merrill Lynch Investment Managers, LLC ("MLIM, LLC"), an affiliate of FAM, as the securities lending agent for a fee based on a share of the returns on investment of cash collateral. MLIM, LLC may, on behalf of the Fund, invest cash collateral received by the Fund for such loans, among other things, in a private investment company managed by MLIM, LLC or in registered money market funds advised by Merrill Lynch Investment Managers, L.P. ("MLIM"), an affiliate of FAM. For the year ended August 31, 2006, MLIM, LLC received $34,558 in securities lending agent fees. For the year ended August 31, 2006, the Fund reimbursed MLIM $31,777 for certain accounting services. In addition, MLPF&S received $6,640 in commissions on the execution of portfolio security transactions for the Fund for the year ended August 31, 2006. Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is the Fund's transfer agent. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (continued) In February 2006, ML & Co. and BlackRock, Inc. entered into an agreement to merge ML & Co.'s investment management business, including FAM, to the investment management business of BlackRock, Inc. The transaction will close on September 29, 2006. On August 31, 2006, shareholders of the Fund approved a new Investment Advisory Agreement with BlackRock Advisors, Inc. (the "Manager"), a wholly owned subsidiary of BlackRock, Inc. BlackRock Advisors, Inc. was reorganized into BlackRock Advisors, LLC. The new advisory agreement will become effective on September 29, 2006 and the investment advisory fee is unchanged. In addition, the Manager has entered into a sub-advisory agreement with BlackRock Financial Management, Inc., an affiliate, under which the Manager pays the Sub- Adviser for services it provides a fee equal to 59% of the management fee paid to the Manager. In connection with the closing, the Fund's Transfer Agent will become PFPC, Inc., an affiliate of the Fund. In addition, BlackRock Distributors, Inc., an affiliate of BlackRock, Inc., will become an additional distributor. MLIM, LLC, the security lending agent, will become BlackRock Investment Management, LLC. During the year ended August 31, 2006, certain officers and/or trustees of the Fund are officers and/or directors of FAM, PSI, FAMD, FDS, MLIM, ML & Co., and/or MLIM, LLC. 3. Investments: Purchases (including pay-ups) and sales (including paydowns) of investments, excluding short-term securities, for the year ended August 31, 2006 were $1,702,599,036 and $1,837,219,398, respectively. Transactions in call and put options written for the year ended August 31, 2006 were as follows: Call Options Number of Premiums Written Contracts* Received Outstanding call options written, beginning of year 164 $ 527,750 Options written 395 3,075,344 Options expired (25) (52,500) Options closed (534) (3,550,594) --------------- --------------- Outstanding call options written, end of year -- -- =============== =============== * Some contracts include a notional amount of $1,000,000. Put Options Number of Premiums Written Contracts* Received Outstanding put options written, beginning of year 164 $ 734,075 Options written 3,473 4,376,509 Options expired (2,025) (203,360) Options closed (612) (4,707,419) --------------- --------------- Outstanding put options written, end of year 1,000 $ 199,805 =============== =============== * Some contracts include a notional amount of $1,000,000. 4. Shares of Beneficial Interest: Net decrease in net assets derived from beneficial interest transactions was $168,429,370 and $184,361,007 for the years ended August 31, 2006 and August 31, 2005, respectively. Transactions in shares of beneficial interest for each class were as follows: Class A Shares for the Year Dollar Ended August 31, 2006 Shares Amount Shares sold 14,034,123 $ 139,430,194 Automatic conversion of shares 1,919,435 19,124,470 Shares issued to shareholders in reinvestment of dividends and distributions 1,207,088 12,026,011 --------------- --------------- Total issued 17,160,646 170,580,675 Shares redeemed (22,801,500) (227,761,721) --------------- --------------- Net decrease (5,640,854) $ (57,181,046) =============== =============== Class A Shares for the Year Dollar Ended August 31, 2005 Shares Amount Shares sold 13,755,263 $ 141,240,518 Automatic conversion of shares 1,537,836 15,782,440 Shares issued to shareholders in reinvestment of dividends 1,088,754 11,168,892 --------------- --------------- Total issued 16,381,853 168,191,850 Shares redeemed (18,900,986) (194,005,388) --------------- --------------- Net decrease (2,519,133) $ (25,813,538) =============== =============== BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (continued) Class B Shares for the Year Dollar Ended August 31, 2006 Shares Amount Shares sold 3,157,042 $ 31,497,878 Shares issued to shareholders in reinvestment of dividends and distributions 808,510 8,059,966 --------------- --------------- Total issued 3,965,552 39,557,844 --------------- --------------- Shares redeemed (10,852,414) (108,231,513) Automatic conversion of shares (1,919,232) (19,124,470) --------------- --------------- Total redeemed (12,771,646) (127,355,983) --------------- --------------- Net decrease (8,806,094) $ (87,798,139) =============== =============== Class B Shares for the Year Dollar Ended August 31, 2005 Shares Amount Shares sold 3,965,033 $ 40,697,638 Shares issued to shareholders in reinvestment of dividends 832,873 8,544,862 --------------- --------------- Total issued 4,797,906 49,242,500 --------------- --------------- Shares redeemed (13,411,984) (137,655,114) Automatic conversion of shares (1,537,822) (15,782,440) Total redeemed (14,949,806) (153,437,554) --------------- --------------- Net decrease (10,151,900) $ (104,195,054) =============== =============== Class C Shares for the Year Dollar Ended August 31, 2006 Shares Amount Shares sold 4,562,366 $ 45,490,143 Shares issued to shareholders in reinvestment of dividends and distributions 683,248 6,804,286 --------------- --------------- Total issued 5,245,614 52,294,429 Shares redeemed (7,924,594) (78,982,746) --------------- --------------- Net decrease (2,678,980) $ (26,688,317) =============== =============== Class C Shares for the Year Dollar Ended August 31, 2005 Shares Amount Shares sold 4,015,656 $ 41,183,291 Shares issued to shareholders in reinvestment of dividends 592,719 6,079,698 --------------- --------------- Total issued 4,608,375 47,262,989 Shares redeemed (9,720,117) (99,718,766) --------------- --------------- Net decrease (5,111,742) $ (52,455,777) =============== =============== Class I Shares for the Year Dollar Ended August 31, 2006 Shares Amount Shares sold 10,661,158 $ 106,292,718 Shares issued to shareholders in reinvestment of dividends and distributions 53,204 528,527 --------------- --------------- Total issued 10,714,362 106,821,245 Shares redeemed (11,620,728) (115,699,933) --------------- --------------- Net decrease (906,366) $ (8,878,688) =============== =============== Class I Shares for the Year Dollar Ended August 31, 2005 Shares Amount Shares sold 14,818,949 $ 152,032,859 Shares issued to shareholders in reinvestment of dividends 41,103 421,526 --------------- --------------- Total issued 14,860,052 152,454,385 Shares redeemed (16,211,687) (166,192,288) --------------- --------------- Net decrease (1,351,635) $ (13,737,903) =============== =============== Class R Shares for the Year Dollar Ended August 31, 2006 Shares Amount Shares sold 2,135,593 $ 21,295,285 Shares issued to shareholders in reinvestment of dividends and distributions 103,968 1,032,502 --------------- --------------- Total issued 2,239,561 22,327,787 Shares redeemed (1,024,602) (10,210,967) --------------- --------------- Net increase 1,214,959 $ 12,116,820 =============== =============== Class R Shares for the Year Dollar Ended August 31, 2005 Shares Amount Shares sold 1,626,211 $ 16,665,960 Shares issued to shareholders in reinvestment of dividends 43,218 442,418 --------------- --------------- Total issued 1,669,429 17,108,378 Shares redeemed (514,000) (5,267,113) --------------- --------------- Net increase 1,155,429 $ 11,841,265 =============== =============== 5. Reverse Repurchase Agreement: For the year ended August 31, 2006, the Fund's average amount outstanding was approximately $183,246,000 and daily weighted average interest rate was 4.58%. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Notes to Financial Statements (concluded) 6. Short-Term Borrowings: The Fund, along with certain other funds managed by FAM and its affiliates, is a party to a $500,000,000 credit agreement with a group of lenders, which expires November 2006. The Fund may borrow under the credit agreement to fund shareholder redemptions and for other lawful purposes other than for leverage. The Fund may borrow up to the maximum amount allowable under the Fund's current prospectus and statement of additional information, subject to various other legal, regulatory or contractual limits. The Fund pays a commitment fee of .07% per annum based on the Fund's pro rata share of the unused portion of the credit agreement. Amounts borrowed under the credit agreement bear interest at a rate equal to, at each Fund's election, the federal funds rate plus .50% or a base rate as defined in the credit agreement. The Fund did not borrow under the credit agreement during the year ended August 31, 2006. 7. Distributions to Shareholders: The tax character of distributions paid during the fiscal years ended August 31, 2006 and August 31, 2005 was as follows: 8/31/2006 8/31/2005 Distributions paid from: Ordinary income $ 63,901,098 $ 61,391,565 Tax return of capital 2,191,090 -- --------------- --------------- Total taxable distributions $ 66,092,188 $ 61,391,565 =============== =============== As of August 31, 2006, the components of accumulated losses on a tax basis were as follows: Accumulated distributions in excess of investment income--net $ (1,492,965) Undistributed long-term capital gains--net -- --------------- Accumulated distributions in excess of investment income--net (1,492,965) Capital loss carryforward (825,757)* Unrealized losses--net (37,626,710)** --------------- Total accumulated losses--net $ (39,945,432) =============== * On August 31, 2006, the Fund had a net capital loss carryforward of $825,757, all of which expires in 2014. This amount will be available to offset like amounts of any future taxable gains. ** The difference between book-basis and tax-basis net unrealized losses is attributable primarily to the tax deferral of losses on straddles, the realization of tax purposes of unrealized gains (losses) on certain futures contracts and the deferral of post- October capital losses for tax purposes. 8. Plan of Reorganization: On February 15, 2006, the Fund's Board of Trustees approved a plan of reorganization, subject to shareholder approval and certain other conditions, whereby BlackRock Government Income Portfolio (the "Portfolio"), a portfolio of BlackRock Funds (SM), will acquire substantially all of the assets and assume substantially all of the liabilities of the Fund in exchange for newly issued shares of the Portfolio. 9. Share Class Redesignation: Effective October 2, 2006, Class A, Class B, Class C and Class I Shares will be redesignated Investor A1, Investor B1, Investor C1 and Institutional Shares, respectively. Class R Shares will remain Class R Shares. Investor B1 and Investor C1 Shares will no longer be available for purchase except through dividend reinvestment in connection with existing holdings or through certain authorized qualified employee benefit plans. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Report of Independent Registered Public Accounting Firm To the Shareholders and Board of Trustees of BlackRock U.S. Government Fund: We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of BlackRock U.S. Government Fund (formerly Merrill Lynch U.S. Government Fund) as of August 31, 2006, and the related statement of operations and cash flows for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the Fund's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. The Fund is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Fund's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of August 31, 2006, by correspondence with the custodian and brokers; where replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of BlackRock U.S. Government Fund as of August 31, 2006, the results of its operations and cash flows for the year then ended, the changes in its net assets for each of the two years in the period then ended, and its financial highlights for each of the five years in the period then ended, in conformity with U.S. generally accepted accounting principles. Deloitte & Touche LLP Princeton, New Jersey October 20, 2006 Important Tax Information (unaudited) The following information is provided with respect to the ordinary income distributions paid monthly by BlackRock U.S. Government Fund for the fiscal year ended August 31, 2006: Federal Obligation Interest Month Paid: September 2005 - August 2006 9.05%* Interest-Related Dividends for Non-U.S. Residents Month Paid: September 2005 24.75%** October 2005 - December 2005 87.76%** January 2006 - August 2006 99.30%** * The law varies in each state as to whether and what percentage of dividend income attributable to Federal Obligations is exempt from state income tax. We recommend that you consult your tax advisor to determine if any portion of the dividends you received is exempt from state income taxes. ** Represents the portion of the taxable ordinary income dividends eligible for exemption from U.S. withholding tax for non-resident aliens and foreign corporations. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Disclosure of New Investment Advisory Agreement New BlackRock Investment Advisory Agreement--Matters Considered by the Board In connection with the combination of Merrill Lynch's investment advisory business, including Fund Asset Management, L.P. (the "Previous Investment Adviser"), with that of BlackRock, Inc. ("BlackRock") to create a new independent company ("New BlackRock") (the "Transaction"), the Fund's Board of Trustees considered and approved a new investment advisory agreement (the "BlackRock Investment Advisory Agreement") between the Fund and BlackRock Advisors, LLC ("BlackRock Advisors"). The Fund's shareholders subsequently approved the BlackRock Investment Advisory Agreement and it became effective on September 29, 2006, replacing the investment advisory agreement with the Previous Investment Adviser (the "Previous Investment Advisory Agreement"). The Board discussed the BlackRock Investment Advisory Agreement at telephonic and in-person meetings held during April and May 2006. The Board, including the independent trustees, approved the BlackRock Investment Advisory Agreement at an in-person meeting held on May 9, 2006. To assist the Board in its consideration of the BlackRock Investment Advisory Agreement, BlackRock provided materials and information about BlackRock, including its financial condition and asset management capabilities and organization, and Merrill Lynch provided materials and information about the Transaction. The independent trustees, through their independent legal counsel, also requested and received additional information from Merrill Lynch and BlackRock in connection with their consideration of the BlackRock Investment Advisory Agreement. The additional information was provided in advance of the May 9, 2006 meeting. In addition, the independent trustees consulted with their counsel and Fund counsel on numerous occasions, discussing, among other things, the legal standards and certain other considerations relevant to the trustees' deliberations. At the Board meetings, the trustees discussed with Merrill Lynch management and certain BlackRock representatives the Transaction, its strategic rationale and BlackRock's general plans and intentions regarding the Fund. At these Board meetings, representatives of Merrill Lynch and BlackRock made presentations to and responded to questions from the Board. The trustees also inquired about the plans for and anticipated roles and responsibilities of certain employees and officers of the Previous Investment Adviser, and of its affiliates, to be transferred to BlackRock in connection with the Transaction. The independent trustees of the Board also conferred separately and with their counsel about the Transaction and other matters related to the Transaction, including a proposed reorganization in which the BlackRock Government Income Portfolio, a series of BlackRock Funds (SM), would acquire substantially all of the assets and certain stated liabilities of the Fund. The independent trustees did so on a number of occasions, including in connection with the April and May 2006 meetings. After the presentations and after reviewing the written materials provided, the independent trustees met in executive sessions with their counsel to consider the BlackRock Investment Advisory Agreement. In connection with the Board's review of the BlackRock Investment Advisory Agreement, Merrill Lynch and/or BlackRock advised the trustees about a variety of matters. The advice included the following, among other matters: * that there was not expected to be any diminution in the nature, quality and extent of services provided to the Fund and its shareholders by BlackRock Advisors, including compliance services; * that operation of New BlackRock as an independent investment management firm would enhance its ability to attract and retain talented professionals; * that the Fund was expected to benefit from having access to BlackRock's state of the art technology and risk management analytic tools, including investment tools, provided under the BlackRock Solutions (R) brand name; * that BlackRock had no present intention to alter any applicable expense waivers or reimbursements that were currently in effect and, while it reserved the right to do so in the future, it would seek the approval of the Board before making any changes; * that BlackRock and Merrill Lynch would enter into an agreement, for an initial three-year period and automatically renewable from year to year thereafter (or until any proposed Fund reorganization takes place), in connection with the Transaction under which Merrill Lynch-affiliated broker-dealers would continue to offer the Fund as an investment product; * that BlackRock Advisors would have substantially the same access to the Merrill Lynch sales force when distributing shares of the Fund as was currently being provided to the Previous Investment Adviser and that other arrangements between the Previous Investment Adviser and Merrill Lynch sales channels would be preserved; BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 * that the Fund would have access to BlackRock's network of third party brokers, retirement plan platforms and registered investment advisers; * that in connection with the Transaction, Merrill Lynch and BlackRock had agreed to conduct, and use reasonable best efforts to cause their respective affiliates to conduct, their respective businesses in compliance with the conditions of Section 15(f) of the Investment Company Act of 1940 (the "1940 Act") in relation to any public funds advised by BlackRock or the Previous Investment Adviser (or affiliates), respectively; and * that Merrill Lynch and BlackRock would derive benefits from the Transaction and that, as a result, they had a financial interest in the matters being considered that was different from that of Fund shareholders. The trustees considered the information provided by Merrill Lynch and BlackRock above, and, among other factors, the following: * the potential benefits to Fund shareholders from being part of a combined fund family with BlackRock-sponsored funds, including possible economies of scale and access to investment opportunities; * the potential for expanding distribution of Fund shares through improved access to third party distribution (in the event the proposed reorganization of the Fund does not take place); * the reputation, financial strength and resources of BlackRock and its investment advisory subsidiaries and the anticipated financial strength and resources of New BlackRock; * the compliance policies and procedures of BlackRock Advisors; * the terms and conditions of the BlackRock Investment Advisory Agreement, including the fact that the Fund's advisory fee schedule would not increase under the BlackRock Investment Advisory Agreement, but would remain the same; * that in February 2006, the Board had performed a full annual review of the Previous Investment Advisory Agreement, as required by the 1940 Act, and had determined that the Previous Investment Adviser had the capabilities, resources and personnel necessary to provide the advisory and administrative services that were then being provided to the Fund; and that the advisory and/or management fees paid by the Fund, taking into account any applicable agreed-upon fee waivers and breakpoints, had represented reasonable compensation to the Previous Investment Adviser in light of the services provided, the costs to the Previous Investment Adviser of providing those services, economies of scale, the fees and other expenses paid by similar funds (including information provided by Lipper Inc. ["Lipper"]), and such other matters as the trustees had considered relevant in the exercise of their reasonable judgment; and * that Merrill Lynch had agreed to pay all expenses of the Fund in connection with the Board's consideration of the BlackRock Investment Advisory Agreement and related agreements and all costs of shareholder approval of the BlackRock Investment Advisory Agreement and as a result the Fund would bear no costs in obtaining shareholder approval of the BlackRock Investment Advisory Agreement. Certain of these considerations are discussed in more detail below. In its review of the BlackRock Investment Advisory Agreement, the Board assessed the nature, quality and scope of the services to be provided to the Fund by the personnel of BlackRock Advisors and its affiliates, including administrative services, shareholder services, oversight of fund accounting, marketing services and assistance in meeting legal and regulatory requirements. In its review of the BlackRock Investment Advisory Agreement, the Board also considered a range of information in connection with its oversight of the services to be provided by BlackRock Advisors and its affiliates. Among the matters considered were: (a) fees (in addition to management fees) to be paid to BlackRock Advisors and its affiliates by the Fund; (b) Fund operating expenses paid to third parties; (c) the resources devoted to and compliance reports relating to the Fund's investment objective, policies and restrictions, and its compliance with its Code of Ethics and BlackRock Advisors' compliance policies and procedures; and (d) the nature, cost and character of non-investment management services to be provided by BlackRock Advisors and its affiliates. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Disclosure of New Investment Advisory Agreement (continued) In the period prior to the Board meeting to consider renewal of the Previous Investment Advisory Agreement, the Board had requested and received materials specifically relating to the Previous Investment Advisory Agreement. These materials included (a) information compiled by Lipper on the fees and expenses and the investment performance of the Fund as compared to a comparable group of funds as classified by Lipper; (b) a discussion by the Fund's portfolio management team on investment strategies used by the Fund during its most recent fiscal year; (c) information on the profitability to the Previous Investment Adviser of the Previous Investment Advisory Agreement and other payments received by the Previous Investment Adviser and its affiliates from the Fund; and (d) information provided by the Previous Investment Adviser concerning services related to the valuation and pricing of Fund portfolio holdings, the Fund's portfolio turnover statistics and direct and indirect benefits to the Previous Investment Adviser and its affiliates from their relationship with the Fund. In their deliberations, the trustees considered information received in connection with their most recent continuation of the Previous Investment Advisory Agreement, in addition to information provided by BlackRock and BlackRock Advisors in connection with their evaluation of the terms and conditions of the BlackRock Investment Advisory Agreement. The trustees did not identify any particular information that was all-important or controlling. The trustees, including a majority of the independent trustees, concluded that the terms of the BlackRock Investment Advisory Agreement are appropriate, that the fees to be paid are reasonable in light of the services to be provided to the Fund, and that the BlackRock Investment Advisory Agreement should be approved and recommended to Fund shareholders. Nature, Quality and Extent of Services Provided--The Board reviewed the nature, quality and extent of services provided by the Previous Investment Adviser, including the investment advisory services and the resulting performance of the Fund, as well as the nature, quality and extent of services expected to be provided by BlackRock Advisors. The Board focused primarily on the Previous Investment Adviser's investment advisory services and the Fund's investment performance, but also considered certain areas in which both the Previous Investment Adviser and the Fund received services as part of the Merrill Lynch complex. The Board compared the Fund's performance - both including and excluding the effects of fees and expenses - to the performance of a comparable group of mutual funds, and the performance of a relevant index or combination of indexes. While the Board reviews performance data at least quarterly, consistent with the Previous Investment Adviser's investment goals, the Board attaches more importance to performance over relatively long periods of time, typically three to five years. In evaluating the nature, quality and extent of the services to be provided by BlackRock Advisors under the BlackRock Investment Advisory Agreement, the trustees considered, among other things, the expected impact of the Transaction on the operations, facilities, organization and personnel of New BlackRock and how it would affect the Fund; the ability of BlackRock Advisors to perform its duties after the Transaction; and any anticipated changes to the investment and other practices of the Fund. The trustees considered the fact that it was being proposed that the BlackRock Government Income Portfolio, a series of BlackRock Funds (SM), acquire substantially all of the assets and certain stated liabilities of the Fund as part of a reorganization. The trustees considered BlackRock's advice, in connection with both the Transaction and the proposed reorganization, as to proposed changes in portfolio management personnel of the Fund after the closing of the Transaction. The trustees were given information with respect to the potential benefits to the Fund and its shareholders from having access to BlackRock's state of the art technology and risk management analytic tools, including the investment tools provided under the BlackRock Solutions brand name. The trustees were advised that, as a result of Merrill Lynch's equity interest in BlackRock after the Transaction, the Fund would continue to be subject to restrictions concerning certain transactions involving Merrill Lynch affiliates (for example, transactions with a Merrill Lynch broker-dealer acting as principal) absent revised or new regulatory relief. The trustees were advised that a revision of existing regulatory relief with respect to these restrictions was being sought from the Securities and Exchange Commission and were advised of the possibility of receipt of such revised regulatory relief. Based on their review of the materials provided and the assurances they had received from the management of Merrill Lynch and of BlackRock, the trustees determined that the nature and quality of services to be provided to the Fund under the BlackRock Investment Advisory Agreement were expected to be as good as or better than that provided under the Previous Investment Advisory Agreement. It was noted, however, that changes in personnel were expected to follow the Transaction and the combination of the operations of the Previous Investment Adviser and its affiliates with those of BlackRock. The trustees noted that if portfolio managers or other personnel were to cease to be available prior to the closing of the Transaction, the Board would consider all available options, including seeking the investment advisory or other services of BlackRock affiliates. Accordingly, the trustees concluded that, overall, they were satisfied at the present time with assurances from BlackRock and BlackRock Advisors as to the expected nature, quality and extent of the services to be provided to the Fund under the BlackRock Investment Advisory Agreement. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Costs of Services Provided and Profitability--It was noted that, in conjunction with the recent review of the Previous Investment Advisory Agreement, the trustees had received, among other things, a report from Lipper comparing the Fund's fees and expenses to those of a peer group selected by Lipper, and information as to the fees charged by the Previous Investment Adviser or its affiliates to other registered investment company clients for investment management services. The Board reviewed the Fund's contractual management fee rate and actual management fee rate as a percentage of total assets at common asset levels - the actual rate includes advisory fees and the effects of any fee waivers - compared to the other funds in its Lipper category. They also compared the Fund's total expenses to those of other comparable funds. The information showed that the Fund had fees and expenses within the range of fees and expenses of comparable funds. The Board considered the services to be provided by and the fees to be charged by BlackRock Advisors to other funds with similar investment mandates and noted that the fees charged by BlackRock Advisors in those cases, including fee waivers and expense reimbursements, were generally comparable to those being charged to the Fund. The Board also noted that, as a general matter, according to the information provided by BlackRock, fees charged to institutional clients were lower than the fees charged to the Fund, but BlackRock Advisors provided less extensive services to such clients. The Board concluded that the Fund's management fee and fee rate and overall expense ratio are reasonable compared to those of other comparable funds. In evaluating the costs of the services to be provided by BlackRock Advisors under the BlackRock Investment Advisory Agreement, the trustees considered, among other things, whether advisory fees or other expenses would change as a result of the Transaction. Based on their review of the materials provided and the fact that the BlackRock Investment Advisory Agreement is substantially similar to the Previous Investment Advisory Agreement in all material respects, including the rate of compensation, the trustees determined that the Transaction should not increase the total fees payable, including any fee waivers or after any expense caps or expense reimbursements, for advisory and administrative services. The trustees noted that it was not possible to predict how the Transaction would affect BlackRock Advisors' profitability from its relationship with the Fund. The trustees discussed with BlackRock Advisors its general methodology to be used in determining its profitability with respect to its relationship with the Fund and noted that they expect to receive profitability information from BlackRock Advisors on at least an annual basis. Fees and Economies of Scale--The Board considered the extent to which economies of scale might be realized as the assets of the Fund increase and whether there should be changes in the management fee rate or structure in order to enable the Fund to participate in these economies of scale. The Board determined that changes were not currently necessary and that the Fund appropriately participated in these economies of scale. In reviewing the Transaction, the trustees considered, among other things, whether advisory fees or other expenses would change as a result of the Transaction. Based on the fact that the BlackRock Investment Advisory Agreement is substantially similar to the Previous Investment Advisory Agreement in all material respects, including the rate of compensation, the trustees determined that as a result of the Transaction, the Fund's total advisory fees would be no higher than the fees under the Previous Investment Advisory Agreement. The trustees concluded that because the rates for advisory fees for the Fund would be no higher than the fee rates in effect at the time, the proposed management fee structure, including any fee waivers, was reasonable and that no additional changes were currently necessary. Fall-Out Benefits--The trustees considered whether the Fund would generate any fall-out benefits to BlackRock Advisors. Fall-out benefits are indirect profits from other activities that accrue to the adviser or its affiliates solely because of the existence of the Fund. In evaluating the fall-out benefits to be received by BlackRock Advisors under the BlackRock Investment Advisory Agreement, the trustees considered whether BlackRock Advisors would experience such benefits to the same extent that the Previous Investment Adviser was experiencing such benefits under the Previous Investment Advisory Agreement. Based on their review of the materials provided, including materials received in connection with their most recent continuance of the Previous Investment Advisory Agreement, and their discussions with management of the Previous Investment Adviser and BlackRock, the trustees determined that BlackRock Advisors' fall-out benefits could include increased ability for BlackRock to distribute shares of its funds and other investment products. The trustees noted that any such benefits were difficult to quantify with certainty at this time, and indicated that they would continue to evaluate them going forward. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Disclosure of New Investment Advisory Agreement (concluded) Investment Performance--The trustees considered investment performance for the Fund. The trustees compared the Fund's performance - both including and excluding the effects of fees and expenses - to the performance of a comparable group of mutual funds, and the performance of a relevant index or combination of indexes. The comparative information received from Lipper showed Fund performance at various levels within the range of performance of comparable funds over different time periods. The trustees believed the Fund's performance was satisfactory. Also, the trustees took into account the investment performance of funds advised by BlackRock Advisors. The Board considered comparative information from Lipper which showed that the performance of the funds advised by BlackRock Advisors was within the range of performance of comparable funds over different time periods. The Board also noted that, following the close of the Transaction and particularly if the proposed reorganization of the Fund did not take place, BlackRock Advisors intended to implement steps to seek to improve the investment performance of the Fund, including changes in the portfolio management personnel. The Board noted BlackRock's considerable investment management experience and capabilities, but was unable to predict what effect, if any, consummation of the Transaction would have on the future performance of the Fund. Conclusion--After the independent trustees of the Fund deliberated in executive session, the entire Board, including the independent trustees, approved the BlackRock Investment Advisory Agreement, concluding that the advisory fee rate was reasonable in relation to the services provided and that the BlackRock Investment Advisory Agreement was in the best interests of the shareholders. In approving the BlackRock Investment Advisory Agreement, the Board anticipated that in the event the proposed reorganization of the Fund did not take place, it expected to review the continuance of the agreement in advance of the expiration of the initial two-year period. New BlackRock Sub-Advisory Agreement--Matters Considered by the Board At an in-person meeting held on August 22 - 23, 2006, the Board of Trustees, including the independent trustees, discussed and approved the sub-advisory agreement (the "BlackRock Sub-Advisory Agreement") between BlackRock Advisors and its affiliate, BlackRock Financial Management, Inc. (the "Sub-Adviser"). The BlackRock Sub-Advisory Agreement became effective on September 29, 2006, at the same time the BlackRock Investment Advisory Agreement became effective. Pursuant to the BlackRock Sub-Advisory Agreement, the Sub-Adviser receives a monthly fee from BlackRock Advisors equal to 59% of the advisory fee received by BlackRock Advisors from the Fund. BlackRock Advisors pays the Sub-Adviser out of its own resources, and there is no increase in Fund expenses as a result of the BlackRock Sub-Advisory Agreement. In approving the BlackRock Sub-Advisory Agreement at the August in-person meeting, the Board reviewed its considerations in connection with its approval of BlackRock Investment Advisory Agreement in May 2006. The Board relied on the same information and considered the same factors as those discussed above in connection with the approval of the BlackRock Investment Advisory Agreement, and came to the same conclusions. In reviewing the sub-advisory fee rate provided in the BlackRock Sub-Advisory Agreement, the Board noted the fact that both BlackRock Advisors and the Sub-Adviser have significant responsibilities under their respective advisory agreements. BlackRock Advisors remains responsible for oversight of the Fund's operations and administration, and the Sub-Adviser provides advisory services to the Fund and is responsible for the day-to-day management of the Fund's portfolio under the BlackRock Sub-Advisory Agreement. The Board also took into account the fact that there is no increase in total advisory fees paid by the Fund as a result of the BlackRock Sub-Advisory Agreement. Under all of the circumstances, the Board concluded that it was a reasonable allocation of fees for the Sub- Adviser to receive 59% of the advisory fee paid by the Fund to BlackRock Advisors. After the independent trustees deliberated in executive session, the entire Board, including the independent trustees, approved the BlackRock Sub-Advisory Agreement, concluding that the sub-advisory fee was reasonable in relation to the services provided and that the BlackRock Sub-Advisory Agreement was in the best interests of shareholders. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Officers and Trustees Number of Portfolios in Other Public Position(s) Length of Fund Complex Directorships Held with Time Overseen by Held by Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Trustee Trustee Interested Trustee Robert C. Doll, Jr.* President 2005 to Vice Chairman and Director of BlackRock, and 129 Funds None P.O. Box 9011 and present Global Chief Investment Officer for Equities, 174 Portfolios Princeton, Trustee Chairman of the BlackRock Private Client NJ 08543-9011 Operating Committee, and member of the Age: 52 BlackRock Executive Committee since 2006; President of the Funds advised by Merrill Lynch Investment Managers ("MLIM") and its affiliates ("MLIM/FAM-advised funds") from 2005 to 2006 and Chief Investment Officer thereof from 2001 to 2006; President of MLIM and Fund Asset Management, L.P. ("FAM") from 2001 to 2006; Co-Head (Americas Region) thereof from 2000 to 2001 and Senior Vice President from 1999 to 2001; President and Director of Princeton Services, Inc. ("Princeton Services") since 2001; President of Princeton Administrators, L.P. ("Princeton Administrators") from 2001 to 2006; Chief Investment Officer of OppenheimerFunds, Inc. in 1999 and Executive Vice President thereof from 1991 to 1999. * Mr. Doll is a director, trustee or member of an advisory board of certain other investment companies for which BlackRock acts as investment adviser. Mr. Doll is an "interested person," as defined in the Investment Company Act, of the Fund based on his current and former positions with BlackRock, Inc. and its affiliates. Trustees serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. As Fund President, Mr. Doll serves at the pleasure of the Board of Trustees. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Officers and Trustees (continued) Number of Portfolios in Other Public Position(s) Length of Fund Complex Directorships Held with Time Overseen by Held by Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Trustee Trustee Independent Trustees* James H. Bodurtha** Trustee 2002 to Director, The China Business Group, Inc. 39 Funds None P.O. Box 9095 present since 1996 and Executive Vice President 59 Portfolios Princeton, thereof from 1996 to 2003; Chairman of the NJ 08543-9095 Board, Berkshire Holding Corporation since Age: 62 1980; Partner, Squire, Sanders & Dempsey from 1980 to 1993. Kenneth A. Froot Trustee 2005 to Professor, Harvard University since 1992; 39 Funds None P.O. Box 9095 present Professor, Massachusetts Institute of 59 Portfolios Princeton, Technology from 1986 to 1992. NJ 08543-9095 Age: 49 Joe Grills** Trustee 1994 to Member of the Committee of Investment of 39 Funds Kimco Realty P.O. Box 9095 present Employee Benefit Assets of the Association of 59 Portfolios Corporation Princeton, Financial Professionals ("CIEBA") since 1986; NJ 08543-9095 Member of CIEBA's Executive Committee since Age: 71 1988 and its Chairman from 1991 to 1992; Assistant Treasurer of International Business Machines Corporation ("IBM") and Chief Investment Officer of IBM Retirement Funds from 1986 to 1993; Member of the Investment Advisory Committee of the State of New York Common Retirement Fund since 1989; Member of the Investment Advisory Committee of the Howard Hughes Medical Institute from 1997 to 2000; Director, Duke University Management Company from 1992 to 2004, Vice Chairman thereof from 1998 to 2004, and Director Emeritus thereof since 2004; Director, LaSalle Street Fund from 1995 to 2001; Director, Kimco Realty Corporation since 1997; Member of the Investment Advisory Committee of the Virginia Retirement System since 1998, Vice Chairman thereof from 2002 to 2005, and Chairman thereof since 2005; Director, Montpelier Foundation since 1998 and its Vice Chairman since 2000; Member of the Investment Committee of the Woodberry Forest School since 2000; Member of the Investment Committee of the National Trust for Historic Preservation since 2000. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Officers and Trustees (continued) Number of Portfolios in Other Public Position(s) Length of Fund Complex Directorships Held with Time Overseen by Held by Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Trustee Trustee Independent Trustees* (concluded) Herbert I. London Trustee 2002 to Chairman of the Board of Directors of 39 Funds None P.O. Box 9095 present Vigilant Research, Inc. since 2006; Member 59 Portfolios Princeton, of the Board of Directors for Grantham NJ 08543-9095 University since 2006; Director of AIMS since Age: 67 2006; Director of Reflex Security since 2006; Director of InnoCentive, Inc. since 2006; Director of Cerego, LLC since 2005; Professor Emeritus, New York University since 2005; John M. Olin Professor of Humanities, New York University from 1993 to 2005; and Professor thereof from 1980 to 2005; President, Hudson Institute since 1997 and Trustee thereof since 1980; Dean, Gallatin Division of New York University from 1976 to 1993; Distinguished Fellow, Herman Kahn Chair, Hudson Institute from 1984 to 1985; Director, Damon Corp. from 1991 to 1995; Overseer, Center for Naval Analyses from 1983 to 1993. Roberta Cooper Ramo Trustee 2002 to Shareholder, Modrall, Sperling, Roehl, 39 Funds None P.O. Box 9095 present Harris & Sisk, P.A. since 1993; President, 59 Portfolios Princeton, American Bar Association from 1995 to 1996 NJ 08543-9095 and Member of the Board of Governors thereof Age: 64 from 1994 to 1997; Shareholder, Poole, Kelly and Ramo, Attorneys at Law P.C. from 1977 to 1993; Director of ECMC Group (service provider to students, schools and lenders) since 2001; Director, United New Mexico Bank (now Wells Fargo) from 1983 to 1988; Director, First National Bank of New Mexico (now Wells Fargo) from 1975 to 1976; Vice President, American Law Institute since 2004. Robert S. Salomon, Jr. Trustee 1996 to Principal of STI Management (investment 39 Funds None P.O. Box 9095 present adviser) from 1994 to 2005; Chairman and 59 Portfolios Princeton, CEO of Salomon Brothers Asset Management Inc. NJ 08543-9095 from 1992 to 1995; Chairman of Salomon Brothers Age: 69 Equity Mutual Funds from 1992 to 1995; regular columnist with Forbes Magazine from 1992 to 2002; Director of Stock Research and U.S. Equity Strategist at Salomon Brothers Inc. from 1975 to 1991; Trustee, Commonfund from 1980 to 2001. * Trustees serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. ** Co-Chairman of the Board of Trustees and the Audit Committee. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Officers and Trustees (concluded) Position(s) Length of Held with Time Name, Address & Age Fund Served Principal Occupation(s) During Past 5 Years Fund Officers* Donald C. Burke Vice 1993 to Managing Director of BlackRock since 2006; Managing Director of MLIM and FAM P.O. Box 9011 President present from 2005 to 2006 and Treasurer thereof from 1999 to 2006; First Vice President of Princeton, and and MLIM and FAM from 1997 to 2005; Senior Vice President and Treasurer of Princeton NJ 08543-9011 Treasurer 1999 to Services from 1999 to 2006 and Director from 2004 to 2006; Vice President of FAM Age: 46 present Distributors, Inc. ("FAMD") from 1999 to 2006 and Director from 2004 to 2006; Vice President of MLIM and FAM from 1990 to 1997; Director of Taxation of MLIM from 1990 to 2001; Vice President, Treasurer and Secretary of the IQ Funds from 2004 to 2006. Thomas F. Musmanno Vice 2005 to Director of BlackRock since 2006; Director of MLIM from 2004 to 2006; Vice President P.O. Box 9011 President present of MLIM from 1996 to 2004; Derivatives and Structured Products Specialist with Princeton, MLIM from 2000 to 2002; Portfolio Manager with MLIM from 1996 to 2006. NJ 08543-9011 Age: 37 Laura Powers Vice 2005 to Director of BlackRock since 2006; Director of MLIM from 1998 to 2006; Vice President P.O. Box 9011 President present of MLIM from 1993 to 1997; Portfolio Manager with MLIM from 1992 to 2006. Princeton, NJ 08543-9011 Age: 43 Frank Viola Vice 2002 to Managing Director of BlackRock since 2006; Managing Director (Global Fixed Income) P.O. Box 9011 President present of MLIM from 2002 to 2006; Head of the Global Fixed Income Structured Asset Team Princeton, from 2002 to 2006; Director of MLIM from 2000 to 2001 and Vice President from NJ 08543-9011 1997 to 2000. Age: 41 Jeffrey Hiller Fund Chief 2004 to Managing Director of BlackRock and Fund Chief Compliance Officer since 2006; Chief P.O. Box 9011 Compliance present Compliance Officer of the MLIM/FAM-advised funds and First Vice President and Chief Princeton, Officer Compliance Officer of MLIM (Americas Region) from 2004 to 2006; Chief Compliance NJ 08543-9011 Officer of the IQ Funds since 2004; Global Director of Compliance at Morgan Stanley Age: 55 Investment Management from 2002 to 2004; Managing Director and Global Director of Compliance at Citigroup Asset Management from 2000 to 2002; Chief Compliance Officer at Soros Fund Management in 2000; Chief Compliance Officer at Prudential Financial from 1995 to 2000; Senior Counsel in the Securities and Exchange Commission's Division of Enforcement in Washington, D.C. from 1990 to 1995. Alice A. Pellegrino Secretary 2004 to Director of BlackRock since 2006; Director (Legal Advisory) of MLIM from 2002 to P.O. Box 9011 present 2006; Vice President of MLIM from 1999 to 2002; Attorney associated with MLIM Princeton, from 1997 to 2006; Secretary of MLIM, FAM, FAMD and Princeton Services from NJ 08543-9011 2004 to 2006. Age: 46 * Officers of the Fund serve at the pleasure of the Board of Trustees. Further information about the Fund's Officers and Trustees is available in the Fund's Statement of Additional Information, which can be obtained without charge by calling 1-800-441-7762. Custodian The Bank of New York 100 Church Street New York, NY 10286 Transfer Agent Pre Transaction (Until September 29, 2006) Financial Data Services, Inc. 4800 Deer Lake Drive East Jacksonville FL 32246-6484 Post Transaction (After September 29, 2006) PFPC Inc. Wilmington, DE 19809 BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Availability of Quarterly Schedule of Investments The Fund files its complete schedule of portfolio holdings with the Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. The Fund's Forms N-Q are available on the SEC's Web site at http://www.sec.gov. The Fund's Forms N-Q may also be reviewed and copied at the SEC's Public Reference Room in Washington, DC. Information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330. Electronic Delivery Electronic copies of most financial reports and prospectuses are available on the Fund's Web site. Shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual reports and prospectuses by enrolling in the Fund's electronic delivery program. To enroll: Shareholders Who Hold Accounts with Investment Advisers, Banks or Brokerages: Please contact your financial adviser. Please note that not all investment advisers, banks or brokerages may offer this service. Shareholders Who Hold Accounts Directly with BlackRock: 1) Access the BlackRock Web site at http://www.blackrock.com/edelivery 2) Log into your account BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 BlackRock Privacy Principles BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, "Clients") and to safeguarding their nonpublic personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties. If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations. BlackRock obtains or verifies personal nonpublic information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our Web sites. BlackRock does not sell or disclose to nonaffiliated third parties any nonpublic personal information about its Clients, except as permitted by law or as is necessary to service Client accounts. These nonaffiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose. We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to nonpublic personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the nonpublic personal information of its Clients, including procedures relating to the proper storage and disposal of such information. BLACKROCK U.S. GOVERNMENT FUND AUGUST 31, 2006 Item 2 - Code of Ethics - The registrant has adopted a code of ethics, as of the end of the period covered by this report, that applies to the registrant's principal executive officer, principal financial officer and principal accounting officer, or persons performing similar functions. A copy of the code of ethics is available without charge at www.blackrock.com. Item 3 - Audit Committee Financial Expert - The registrant's board of directors has determined that (i) the registrant has the following audit committee financial experts serving on its audit committee and (ii) each audit committee financial expert is independent: (1) Joe Grills, (2) Robert S. Salomon, Jr., and (3) Stephen B. Swensrud (retired as of December 31, 2005). Item 4 - Principal Accountant Fees and Services (a) Audit Fees - Fiscal Year Ending August 31, 2006 - $50,900 Fiscal Year Ending August 31, 2005 - $48,000 (b) Audit-Related Fees - Fiscal Year Ending August 31, 2006 - $0 Fiscal Year Ending August 31, 2005 - $0 (c) Tax Fees - Fiscal Year Ending August 31, 2006 - $6,000 Fiscal Year Ending August 31, 2005 - $7,300 The nature of the services include tax compliance, tax advice and tax planning. (d) All Other Fees - Fiscal Year Ending August 31, 2006 - $0 Fiscal Year Ending August 31, 2005 - $0 (e)(1) The registrant's audit committee (the "Committee") has adopted policies and procedures with regard to the pre-approval of services. Audit, audit-related and tax compliance services provided to the registrant on an annual basis require specific pre-approval by the Committee. The Committee also must approve other non-audit services provided to the registrant and those non-audit services provided to the registrant's affiliated service providers that relate directly to the operations and the financial reporting of the registrant. Certain of these non-audit services that the Committee believes are a) consistent with the SEC's auditor independence rules and b) routine and recurring services that will not impair the independence of the independent accountants may be approved by the Committee without consideration on a specific case-by-case basis ("general pre-approval"). However, such services will only be deemed pre-approved provided that any individual project does not exceed $5,000 attributable to the registrant or $50,000 for all of the registrants the Committee oversees. Any proposed services exceeding the pre-approved cost levels will require specific pre- approval by the Committee, as will any other services not subject to general pre-approval (e.g., unanticipated but permissible services). The Committee is informed of each service approved subject to general pre-approval at the next regularly scheduled in-person board meeting. (e)(2) 0% (f) Not Applicable (g) Fiscal Year Ending August 31, 2006 - $3,098,500 Fiscal Year Ending August 31, 2005 - $7,377,027 (h) The registrant's audit committee has considered and determined that the provision of non-audit services that were rendered to the registrant's investment adviser and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Regulation S-X Rule 2-01(c)(7)(ii) - $1,739,500, 0% Item 5 - Audit Committee of Listed Registrants - Not Applicable Item 6 - Schedule of Investments - Not Applicable Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable Item 8 - Portfolio Managers of Closed-End Management Investment Companies - Not Applicable Item 9 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable Item 10 - Submission of Matters to a Vote of Security Holders - The registrant's Nominating Committee will consider nominees to the Board recommended by shareholders when a vacancy becomes available. Shareholders who wish to recommend a nominee should send nominations which include biographical information and sets forth the qualifications of the proposed nominee to the registrant's Secretary. There have been no material changes to these procedures. Item 11 - Controls and Procedures 11(a) - The registrant's certifying officers have reasonably designed such disclosure controls and procedures to ensure material information relating to the registrant is made known to us by others particularly during the period in which this report is being prepared. The registrant's certifying officers have determined that the registrant's disclosure controls and procedures are effective based on our evaluation of these controls and procedures as of a date within 90 days prior to the filing date of this report. 11(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the second fiscal half- year of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12 - Exhibits attached hereto 12(a)(1) - Code of Ethics - See Item 2 12(a)(2) - Certifications - Attached hereto 12(a)(3) - Not Applicable 12(b) - Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. BlackRock U.S. Government Fund By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock U.S. Government Fund Date: October 19, 2006 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock U.S. Government Fund Date: October 19, 2006 By: /s/ Robert C. Doll, Jr. ----------------------- Donald C. Burke, Chief Financial Officer of BlackRock U.S. Government Fund Date: October 19, 2006