有空一起吃午饭

　　A: Do you have some time tomorrow?
　　B: Yes, I do.
　　A: How about having lunch with me?
　　B: Good idea.

　　A: If you’re free, how about lunch?
　　B: When did you have in mind?
　　A: I was thinking about Thursday?
　　B: That will be fine with me.