Các công thức đổi HTHT - QKĐ

Structure 1: 

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time 

--> It is / has been + time + since + S+ (last) + V2/ed 

Structure 2: 

How long + has/have + S+ V3/ed?

--> When + did + S + V1?

--> How long is it + since + S+ V2/ed ?

Structure 3:

S + has/have + V3/ed + for/since + time 

--> S + started / began + to V / Ving 

--> It is / has been + time + since + S+ V2/ed 

Structure 4: 

S + has/have + not/never + V3/ed + ... before

--> This/It is the first time + S+ has/have+ V3/ed

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1. Samiel has kept a diary since 1997.

2. We have learned English for five years.

3. I have lived in Ho Chi Minh City since I was 8.

4. She started to teach the children in this remote village five months ago.

5. The last time he wrote to me was in April.

6. She last had a swim five years ago.

7. They haven't talked to each other for two months.

8. She hasn't seen her elder sister since 1999.

9. The last time she wrote to me was years ago.

10. Robert and Catherine started to get married ten years ago.

11. They last cleaned their room 2 weeks ago.

12. John hasn't had his hair cut for over six months.

13. It's the first time we have ever eaten this kind of food.

14. I have never seen this film before.

15. He hasn't gone abroad before.

16. She has driven for 1 month.

17. We have eaten since it started to rain.

18. I haven't had my hair cut since I left her.

19. She hasn't kissed me for 5 months.

20. We haven't met for a long time.

21. I haven't had such a delicious meal before.

22. The last time I saw him was 8 days ago.

23. I last took a bath last Monday.

24. I haven't had a puncture for 2 years.

25. He has earned money for 2 months.

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