1. 按要求完成句子改写。

1. （1） You can't arrive late for class. (改为祈使句)

     late for class.

3. （2） He has to listen to music outside. (改为一般疑问句)

    He  to listen to music outside?

5. （3） We have to be quiet in the library. (对划线部分提问)

    do you have to  in the library?

7. （4） You must eat in the dining hall. (改为祈使句)

     the dining hall.

9. （5） We can eat in the classroom. (改为一般疑问句, 并作否定回答)

   —  we eat in the classroom?
   

   —No, we .