1. I must know what you are talking about.
2. I hear that you have been in this country for some time.
3. He admires you tremendously. He has seen the play three times.
4. I don't know what Harry always says to you.
5. I want to see how much he has changed since I saw him last.
6. We have been to the pictures about twice a week ever since.
7. Hallo, what are you doing here at his late hour?
8. I suppose you have never had anything to do with those people?
9. She has been awake since two in the morning.
10. I always stay in my dressing-room and rest till the evening performance. - Can't I come and see you while you rest?
11. I hear you are looking for a new house.
12. Since the tragedy Mr. Holmes and I have heard of many strange things.
13. Has anything else happened since your arrival in London?
1.can,could, could
2.be , was/were, been
3.bite , bit ,bitten
4.buy , bought, bought
5.bting , brought, brought