What have I been doing?

1. The teacher explains that the students have to guess what the teacher has been doing from a description of his appearance. The activity is not revealed but clues are given in the description, e.g. Teacher: I'm wearing blue shorts. Student: Have you been playing football? Teacher: No, I haven't. I'm carrying a racquet. Student: Have you been playing tennis? Teacher: Yes, I have.2. The students