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4. I wish I had taken my doctor's advice.
6. If we had had a map, we wouldn't have got lost.
7. He regretted not having said goodbye to her at the airport.
8. Mrs.Taylor wishes she lived in a big house.
9. If Mr.Mills hadn't been late every day, he wouldn't have lost his job.
10. If there is a fire, do not use the lift.
11. If he hadn't been late for work every morning, he wouldn't have lost the job.
12. If you get caught doing this, you will go to prison.
13. Unless we hear from you within seven days, the order will be cancelled.
17. Unless you missed the programme, you can really judge.
18. Robert now wishes he had accepted the job.
19. All dogs are thought to have evolved from wolves.
21. If she hadn't received all the support from social workers, she wouldn't be leading a normal life.