1. 句型转换。

1. （1） He's already been back from work. (改为一般疑问句)

     he been back from work ?

3. （2） He's already finished his work. (改为否定句)

   He  finished his work .

5. （3） 一 Has Tony watched the TV show?(作肯定回答)

   — Yes,  .

7. （4） 一 Have your friends left yet?(作否定回答)

   — No,  .

9. （5） He studied hard so that he could pass the exam. (改为同义句)

   He studied hard    pass the exam.