I - Correct tenses
1. didn't break
2. watching - reading
3. have been looking - haven't found
4. did
5. has been - was
6. going - stay
7. hasn't gone - failed
8. had been shown
9. comes
10. be done
11. Have ... been - spent
12. playing - play
13. is opened
14. showing
15. to work
16. were washed
17. had - would go
18. is coming - don't want
19. sleeping
20. talking
II - Rewrite
1. He is a careful driver
2. Tom's mother told him to turn down the radio
3. My father usually has his bicycle cleaned
4. They were seen dumping rubbish
5. My mother is used to getting up early
6. The teacher advised me not to go to school late
7. I haven't seen Rose for three years
8. The problem can be understood by a child
9. Dad speaks English better than Mum
10. If Mary hadn't walked to work in rain, she wouldn't have gotten wet
11. It usually takes me thirty minutes to water the flowers every day
12. He doesn't drive as carefully as he used to (do)
13. Unless we hurry up, we will miss the train
14. Windmills were invented by the Persians 1500 years ago
15. This bicycle hasn't been used for many years