1. Because there was a loud noise next to my door last night, I couldn't sleep.

2. If I knew her number, I would ring her up.

3. If the people protect the environment now, the environment will be nicer.

4. If they had a map, they wouldn't have got lost.

5. Unless he works hard, he will not pass his exam.

6. If I had free time, I could go somewhere.

25. doesn't hurry

26. would look

27. would join

28. won't pass

29. will help

30. were

8. haven't seen 

    hasn't gone/bought

9. lost/has been

10. has changed/came

11. comes

12. have met

13. are singing

14. Have you received

15. had done/went

16. is coming

17. haven't talked

18. aren't listening

19. is coming

20. is your sister going

      is going

21. leaves

22. starts

23. takes

24. Does she often go

1.The weather forecast was inaccurate, so we didn't take the right precautions.

→Had the weather forecast been accurate, we would have taken the right precautions.

2.I am sure it wasn't Nam's fault.

→It can't have been Nam's fault.

3.I'm sure it was Mai who cleared everything up.

→Mai must have cleared everything up.

4. I applied for the job but it was turned down.

→My application for the job was turned down.

5. The Pacific Ocean is on average deeper than the Atlantic.

→The average depth of the Pacific Ocean is greater than that of the Atlantic.

Mấy câu này ôn thi mình ôn đi ôn lại nhiều lần rùi nên dễ lắm

51. You seem a bit run down.

52. That telephone has been out of order for ages.

53. Please stop beating about the bush. I'm in a hurry.

54. All these antiquated customs should be done away with.

55. These problems of ours are just the tip of the iceberg.