句型变换

1. That is his sister.(改为一般疑问句)   

    _____ _____ his sister?

2. Mike is fine.(对划线部分提问)

    _____ _____ Mike?

3.This is my watch. (改为复数形式)

    _____ are my _____ .

4. Those are my brother's computers.(改为否定句)

    _____ _____ my brother's computers.

5. photo, here,family,is my, a, of (连词成句)

    ____________________________________.

控制轧制能省去（）工序，从而能降低成本。