Các công thức đổi HTHT – QKĐ

Type 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 

Type 2: 

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

–> When + did + S + V1?

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

Type 3:

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

–> S + started / began + to V / Ving 

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

Type 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. Samuel has kept a diary since 1997.

2. We have learnt 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. He hasn’t gone abroad before.

6. She has driven for 1 month.

7. We have eaten since it started to rain.

8. I have written blog for 2 months.

9. She has lived in Danang since she was a child.

10. I haven’t seen such a beautiful girl before.

11. This is the first time I have visited Halong Bay.

12. The last time he smoked was 2 years ago.

13. I started to learn French 3 years ago.

14. My father has washed his car since the morning.

15. She has planted roses since half past seven.

16. Jack and Linda have worked here for five years.

17. I have written daily blog for 3 months.

18. He has lived in Ha Noi since he was six years old.

19. It’s the first time Tom has seen “Titanic”.

20. My friends have studied English for fifteen years.

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