3. Choose the correct responses.

Here are the correct responses:
1. b: What are you up to this evening? - Nothing much.
2. a: I'm going swimming on Saturday. What about you? - I don't have any plans yet.
3. a: I'm going to a concert this weekend. - I don't know yet.
4. b: First, I'm going to my tennis lesson. - Cool. Have you got any plans after that?