句式转换。
1. That's my sister. (改为复数形式)    
    _____ are my _____.
2. This is an egg. (改为复数形式)   
     _____ _____ eggs.
3. Those are her cousins. (改为单数形式)   
    _____ _____ her _____.
4. These are his brothers. (改为单数形式)   
    _____ _____ his _____.
5. His brother is a worker. (改为一般疑问句)   
    _____ _____ brother a worker ?
6. These are your brothers. (改为否定句)   
    _____ _____ your brothers.
7. She is my aunt. (改为一般疑问句)   
    _____ she _____ aunt?
8. His keys are on the sofa. (改为一般疑问句并作简短肯定、否定回答)    
    _____ _____ keys on the sofa? Yes, _____ _____ .  _____ they _____.
9. Her backpack is on the bed. (画线提问)  
     _____ _____ her backpack?
10. The baseballs are under the sofa. (画线提问)   
    _____ _____ _____ _____.