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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8. It was five years since I last read a novel.

9. It's been a long time since I last went to Hanoi.

10. This is the first time I have ever eaten this good food.

11. 

- How long ago did you see Linh?

- How long is it since you saw Linh?

12. When did they paint the house?

13. When did he last meet her?

14. We didn't drive a car a long time ago.

16. I last met them a year ago.

`color{orange}{~LeAiFuRuiHuiBao~}`