17. B

18. B

19. D

20. A

Ex3

1. Ever visited - have ever visited

2. Will sit - will be sitting

3. Played - playing

4. Writing - was writing

5. Will have - will be having

6. Made - have made

7. Have been speaking - have spoken

8. Stopped - stops

9. Had got - got

10. Had they played - were they playing

11. Has lived - had lived

12. Had moved - moved

13. Have walk - have been walking

14. Leaved - left

15.; thought - thinking

16. Broke - had broken

17. Always rains - is always raining

18. Wore - was wearing

19 had worked - will have worked

20. Talking - talk

Exercise 3: Tìm và sửa lỗi sai trong câu
1. This is the most beautiful place (that)i ever visited
2. This time next week they will be sitting in the train on their way to Paris.
3. The radio has been playing since 7a.m, I wish someone would tum it off.
4. I came late to class. When I entered the teacher was writing something on the blackboard.
5. They will be having English from nine to ten in this room. Don't annoy them then.
6. I making cakes. That's why my hands are covered with flour.
7. I got a sore throat because I have been speaking for 3 hours.
8. It is raining hard. We can't do anything until it stops.
9. She gets into her shoes, put on her coat and went to the door.
10. What tune they were playing when we came in?
11. That evening we stayed up to talk about the town, where he had lived for a long time.
14. I haven't seen her since we left school.
16. Coming into his room, he found that someone had broken into it.