Ex.4

1. Before I passed the exam, I had worked very hard for it.

2. After I had considered what to study, I decided to major in Maths.

3. Before she went to bed, she had written a letter.

4. After he had checked the prices, he bought a cassette.

5. Before he felt better, he had taken some medicine.

6. After they had argued, they fought.

7. Before she had a fatal accident, she had gone out for a walk.

8. After she faced the matter, she had decided to go away.

9. Before we wrote the assignment, we had read the books.

10. After she watched the film, she wrote a report.

 Ex1.

1. went

2. was raining/ left

3. telephoned/ was reading

4. was coming/ met

5. were having/ came

6. was talking/ saw

7. were leaving/ called

8. was getting/ slipped/ broke

9. fell/ hurt/ was riding

10. was walking/ saw

11. was studying

12. were they doing

13. met

14. taught

15. didn't go

16. was working

17. gave

18. were playing

19. bought

20. was doing