1. You look tired. Have (you been studying) hard?
2. Mr Brown is new here, isn't he? How long has (he been working) for the company?
3. I have (lost) my wallet. Have you seen it anywhere?
4. I have been (reading) the magazine you lent me, but I have (not finished) yet.
5. Have (you/heard) the bad news? Simon has (broken) his leg!
6. How many articles have (you/written)?
7. What have (you been doing)? I have been (waiting) for you for an hour!
8. Bob and his friends have been (playing) golf since this morning.
9. I have (known) Louise for ten years.
10. Mr Brown has been (marking) the exams all morning, but he has
(not read) them all.