A. Yes, it does.
B. No, it doesn't.
C. Yes, it is.

A. Yes, I am.        
B. Yes, I do.

1. I can play the piano. (改为疑问句)
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2. I will promise to write to you. (改为疑问句)
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3. We are going to go to America. (就画线部分提问)
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4. I am very well. (改为同义句)
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5. I can go to the party with my friends. (改为否定句)
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A. No, he doesn't.      
B. Yes, he doesn't        
C. No, he does

1. There are fifty students in the classroom.（对画线部分提问）
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2. I like the red and green sweater. （改为否定句）
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3. Tim's shirt is under the chair.（对画线部分提问）
  _____________________________________
4. There is some milk in the glass.（改为一般疑问句）
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5. This bag is heavier than that bag.（改为同义句）
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6. They are working very hard.（改为感叹句）
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A. this is    
B. it's     
C. it is    
D. it's not

A. Yes, it is        
B. No, it isn't      
C. No, that isn't  
D. Yes, that is

A. she is          
B. she isn't        
C. it is          
D. it isn't

A. No, they aren't          
B. Yes, it is          
C. No, it isn't

A. No, I don't know        
B. Yes, I want a book  
C. No, please