I/
1. is sleeping
2. eat
3. is running/ wants
4. sets
5. is
6. am doing/think/know
7. buys
8. is
9. rains/ is raining
10. is cooking/ cooks
II/
1. have you studied
2. have waited/ hasn't come
3. have lived
4. has read/ have you read
5. hasn't been/ has lived
6. has gone/ has never been
7. have you slept/ have rung
8. has written/ hasn't finished
9. has lost/ has looked
10. Have seen
III/
1. think/ is knocking
2. have written
3. circles
4. are working
5. have you seen
6. flow
7. is crying
8. is smoking
9. goes
10. are/ have been
11. belongs
12. has lost
13. am/ have forgotten
14. have waited
15. Have you ever seen
IV/
1. haven't seen
2. saw
3. has never been
4. have read