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 hasn't gone abroad before.

2. She has driven for 1 month. 

3. We have eaten since it started to rain. 

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

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

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

7. How long have you had it? 

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

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

10. It is Monday since I last took a bath.