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. We haven't met for a long time. 

2. How long have you had this computer? 

3. This is the first time my nephew James has drunk beer. 

4. He has never visited Ha Long Bay before. 

5. She has worked here since last year. 

6. We have eaten lunch since it started to rain. 

7. I haven't had my hair cut since she left me.

8. He hasn't met me for 5 months. 

9. How long have they opened this shopping center? 

10. The last time I went to the zoo was over the year ago.