句型转换。

1. My sister does housework every day.(变为否定句)

    My sister ______ ______ housework every day.

2. Is his name Jack? (作肯定回答)      

    Yes, ______ ______.

3. They are American cars.(改为单数)

    ______ ______ ______ ______.

4. The girl under the tree is my sister. (对划线部分提问)

    ______ ______ is______ sister?

5. There is only one box in the room. (对划线部分提问)

    ______ ______ ______ ______ there in the room ?

6. There are some new watches in the bag. (对划线部分提问)

    ______ ______  in the bag ?

7. He usually goes home by bus. (同意句)

    He usually ______ ______ ______home.