1. 句型转换。

1. （1） He should stop wearing that silly earrings. (否定句)

   He stop wearing that silly earrings.

3. （2） I can't choose which book to buy. (同义句)

   I can't choose which book buy.

5. （3） The boy needs time to do work. (一般疑问句)

   the boy time to do work?

7. （4） My mother has to ask someone to repair her bike. (同义句)

   My mother has to her bike .

9. （5） On Friday afternoon, students are sleepy. (划线提问)

   students sleepy?