1. 句型转换

1. （1） Mary is doing her homework. (改为否定句)

   Mary   her homework.

3. （2） He lies in the bed. (用now改写句子)

   He    in the bed now.

5. （3） They are taking photos. (对划线部分提问)

    are they ?

7. （4） She is swimming in the river. (改为一般疑问句)

     she  in the river?