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. He has worked for this factory for a year.

2. Tom has played the piano for 4 years.

3. I have cooked for the party for 4 hours.

4. She started to work as a doctor 2 years ago.

5. My father has read books for 2 hours.

6. We have learnt how to play the piano for three years.

7. My brother has joined the army since 2022.

8. It is 3 months since it last rained in this area.

9. It's years since I last enjoyed myself so much.

10. The last time my cousin flew to New York was five years ago.

11. I have never read a good book before.

12. She hasn't visited Dalat for two years.

13. I haven't visited that old castle for 2 years.

14. She hasn't met her grandmother for three years.

35. She hasn't met her grandmother for three years.

36. I haven't swum since I was in Frace.

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