1. This is a book. A book is Mary's.                             
2. 你多大了？You are how old?                                  
3. — 你是林涛吗？— 是的。                                    
    — Are you Lin Tao? — Yes, I'm.
4. Is Changjiang River very long?                                 

     This is a book. It's an English book. It is my English book. That is a
dictionary. Is it Lucy's dictionary? No, it isn't. It's Tom's dictionary. Her
dictionary is in her bag. Look! What are these? They're pens. Are they
Tom's pens? No, they aren't. They are Mike's.

1. What's this? It's _______________.
2. What's that? It's _______________.
3. Is it Tom's dictionary? _______________.
4. Where is her dictionary? ______________.
5. Whose pens are those? ________________.

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)
    ________________________.