II. Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn
15. When did he last talk to you?
→ How long is it since he talked to you?

How long: thì dùng hiện tại hoàn thành

16. When did you last telephone him?
→ How long has you telephoned him?

How long: thì dùng hiện tại hoàn thành

17. We have never eaten this kind of food before.
→ It’s the first time we have eaten this kind of food.

Cấu trúc: It's the first time.....S+ have/has+ Ved/V3+ O.

⇒⇒ S+ have/ has+ Ved/V3+ O+ before.

18. This is the first time I have seen this film.
→ I have never seen this film before

19. This is the first time he went abroad.
→ He hasn’t gone aboard before
20. She started driving 1 month ago.
→ She has  driven for a month
21. We began eating when it started to rain.
→ We have eaten since it started to rain.
22. I last had my hair cut when I left her.
→ I haven’t had my hair cut since i left her

cấu trúc S+ last+ved/v2 viết lại với hiện tại hoàn thành 
23. The last time she kissed me was 5 months ago.
→ She hasn’t kissed me for 5 month
24. It is a long time since we last met.
→ We haven’t met for a long time
25. When did you have it ?
→ How long have you had it ?

26. This is the first time I had such a delicious meal .
→ I haven’t ever had a such delicious meal before
27. I haven’t seen him for 8 days.
→ The last i saw him was 8 days ago.
28. I haven’t taken a bath since Monday.
→ It is I took a bath was on Monday.
29. It's 2 years since I had a future.

-> I have had a future for 2 years 

30. It's 2 months since he earned any money.
→ He has  eared any money for 2 months