句型转换。
1. She is my aunt.(改为一般疑问句，作否定回答)
    — _____she _____aunt?  
    —_____
2.  We are good friends. (改为一般疑问句，作肯定回答)
    — _____  good _____?
    — _____.
3. My uncle is a policeman. (改为否定句子)
    My uncle _____a policeman.
4. They are my sisters. (改为单数句子)
    _____ my_____.
5. That boy is my brother.  (改为复数句子)
    _____ our_____.