1. you meet Paul as he is leaving the swimming pool.

-> Have you been swimming?

2. you have just arrived to meet a friend who is waiting for you.

-> Have you been waiting long?

3. you meet a friend in the street. His face and hands are dirty.

-> What have you been doing?

4. a friend of yours is now working in a shop .you want to know how long.

-> How long have you been working there?

5. a friends tells you about his job - he sells computers, you want to know how long.

-> How long have you been selling computers?

1. Have you been swimming?

2. Have you been waiting long?

3. What have you been doing?

4. How long have you been working there?

5. How long have you been selling computers?