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        1. 句型轉(zhuǎn)換
          1. 昨天他不得不早起床趕公共汽車。    
          He          get up early to catch the bus yesterday.  
          2. 現(xiàn)在我必須做作業(yè)。
          I          do my homework now.
          3. I had to get up early yesterday.(改為否定句)
          I               to get up early yesterday.  
          4. She has to clean the room every day. (改為否定句)
          She               to clean the room every day.  
          5. I can dance and sing. (改為否定句)
          I        dance        sing.  
          6. The students can eat in the hallway.(改為一般疑問句)    
                 the students        in the hallway?
          1. had to  2. must  3. didn't have  4. doesn't have   5. can't; or    6. Can;eat
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