1. G: What are you doing?   

    B: I’m thinking. I don’t know the answers to the questions. 

2. B: Where is Jim now?

    G: He might be in the classroom. 

3. G: Must I go to work?

    B: No, you needn’t. 

4. B: I feel terrible. Could you do my homework for me?

    G: OK, but you don’t have to finish it at once.

5. G: Hurry up, Mike. The bus is coming.

    B: Sorry, I can’t walk. My leg hurts.