Exercise 21: Conditional Sentences
1. Could understand
3. Would give
4. Would have told
5. Would be
6. Had
7. Stopped
8. Needed
9. Would find
10. Enjoyed
14. Could permitted
15. Would spent
16. Would accepted
17. Bought
19. Would have written
23. Were see
27. Would have called
28. Would have talked
Exercise 22: Used To
1. Eat
2. Eating
3. Swim
4. Like
5. Speaking
6. Study
7. Dancing
8. Sleep
9. Eating
10. Eating
Exercise 23: Would Rather
1. Stay
2. Had stayed
3. Work
4. Studied
5. Not study
6. Have
7. Stand
8. Not cook
9. Didn't arrived
10. Slept
Exercise 24: Must/Should + Perfective
1. Should have
2. Must be
3. Must damaged
4. Should not park
5. Must studied
6. Should studied
7. Must be
8. Should deposited
9. Must have forgotten
10. Must not have studied
Exercise 25: Modals + Perfective
1. I would
2. Would have gone
3. May have had
4. Should have done
5. Must have forgotten
6. May have slept
7. Might had had
8. Could have lost
9. Shouldn't have driven
10. May have run
