Ex1.
1. Was sitting/ saw
2. Went/shined
3. Was going/ were having
4. Rained/was carrying
5. Were walking/ began
6. Taught/was living/studying
7. Was being burnt/ broke
8. Was eating/were talking
9. Dropped/was washing up/were broken
10. Was writing/ rang
11. Was going/heard/opened/stopped
Ex2.
1. Went/ had finished
2. Had done/saw
3. Thanked/had done
4. Were/had hurt 
5. Had gone/sat/rested
6. Arrived/had already begun
7. Hadn’t seen/met
8. Had learned/ left
9. Remembered/had learned 
10. Told/hadn’t met
11. Asked/came
12. Said/had already seen
13. Had got/started 
14. Arrived/found/had broken
15. Had left/arrived

1,
1. Was sitting, saw
2. Went, shined
3. Was going, were having
4. Rained, was carrying
5. Were walking, began
6. Taught, was living, studying
7. Was being burnt, broke
8. Was eating, were talking
9. Dropped, was washing up, were broken
10. Was writing, rang
11. Was going, heard, opened, stopped

.

.

.

2, 
1. Went, had finished
2. Had done, saw
3. Thanked, had done
4. Were, had hurt 
5. Had gone, sat, rested
6. Arrived, had already begun
7. Hadn’t seen, met
8. Had learned, left
9. Remembered, had learned 
10. Told, hadn’t met
11. Asked, came
12. Said, had already seen
13. Had got, started 
14. Arrived, found, had broken
15. Had left, arrived