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 + not/never + V3/ed + ... before

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

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After + QKHT, QKD

Before + QKD, QKHT

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1.

- After he had done his homework, he went out.

- Before he went out. he had done his homework.

2.

- After she had got dressed, she called her boyfriends to come and pick her up.

- Before she called her boyfriends to come and pick her up, she had got dressed.

3. 

- After they had thought carefully, they painted their house.

- Before they painted their house, they had thought carefully.

4.

- After Lan had called me, she visited me.

- Before Lan visited me, she had called me.

5.

- After I had gone out, the phone rang.

- Before the phone rang, I had gone out.

6.

- After she had just taken the umbrella on, the rain fell down.

- Before the rain fell down, she had just taken the umbrella on.

7. 

- It last rained here a week ago.

- The last time it rained here was a week ago.

8. When did you last meet him?

9. She has never taught us before.

10. 

- I have never heard of such famous women before.

- This is the first time I have ever heard of such famous women.

11. I haven't caught a taxi since last week.

12.

- The last time Jane phoned me was five weeks ago. 

- John hasn't phoned me for five weeks.

13. When did you cook dinner? 

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