句型转换。
1. This is a ruler. (对画线部分进行提问)
_____ _____ this?
2. It's M-E-N. (对画线部分进行提问)
_____ do you _____ _____?
3. It's his jacket. (改为否定句)
_____ _____ _____ _____.
4. It is my mother's watch. (改为一般疑问句，并作否定回答)
— _____ _____ _____ mother's watch?
— _____, _____ _____.
5. Is that a key? (做肯定回答)
_____, _____ _____.
6. It is not my book. (缩写句子)
_____ _____ my book.
