按要求完成下列句子。

1. This is a book. ( 用two 改写句子) 

     ________________________

2. Is that your eraser? (改写为复数形式)

     ________________________?

3. We have uncles and aunts. (改写为单数形式)

     I have ______ ______ and ______ ______.

4. This is my friend. (改为一般疑问句)

     ________________________?

5. Is he your cousin? (作肯定回答)

    ________________________.