The key answer of exercise 1

a)

1. wouldn't have been; had gone
2. would have seen; had waited
3. had used; wouldn't have got
4. had known; would have worn
5. wouldn't have lost; has looked after
6. wouldn't have nought; hadn't been
7. would have gone; had invited
8. hadn't left; wouldn't have got out

b)

1. 'd had
2. 'd parked
3. hadn't slept
4. were
5. 'd seen
6. 'd made
7. didn't like
8. hadn't enjoyed
9. had asked
10. 'd known

c)

1. asked
2. hadn't been
3. told
4. gave
5. woke up
6. hadn't gone off
7. hadn't gone
8. 'd finished
9. waited
10. drove
11. 'd remembered
12. saw
13. 'd forgotten
14. hadn't brought
15. 'd seen
16. 'd put

d)

1. nobody had spoken to her
2. had stopped raining
3. hadn't taken a taxi
4. what time I'd got
5. 'd have got married
6. she hadn't had time
7. 'd have invited more people
8. I'd met her