Ответ:

1. 1. were cycling, started

2. was breaking, was playing

3. was coming, was surfing

4. went off, was baking

5. caught, was falling

6. was playing, began

7. was reading, was turning on

8. were walking, saw

9. were studying, heard

10. was doing, was setting

11. were dancing, fainted

12. fell, broke

13. was shocked, heard

14. was crying, saw

15. were sitting, were playing

16. were you swimming

17. was lying, started

18. was putting, rang

19. were you doing, fell

20. did you break

21. was writing, delivered

22. left, were sitting

23. wasn't swimming, was playing

24. was swimming, was seeing

25. wasn't paying, drove

26. were you doing, was sleeping

27. was sleeping, broke in

28. arrived, was leaving

2. 1. when

2. while

3. when

4. when

5. when

6. when

7. when

8. when

9. when

10. while

11. while

12. when

3. 1. was driving; broke; was getting; was looking; stopped; asked; needed; explained; was taking; asked; agreed.

2. was, didn't ring, was having, was going, was raining, walked, was studying, looked, laughed, was.