句型转换：

1. I have already finished my homework. (否定句)

    I ________ finished my homework _________.

2. Les's go swimming this afternoon, _________ _________(改为反意疑问句).

3. We plant many trees every year.(改为被动语态)

    Many trees _________ _________ by us every year.

4. She has to walk to school every day. (改为一般疑问句) 

    _________ she _________ to work to school every day?

5. It's very wet and cold today. (就划线部分提问) 

   _________ the weather _________ today?