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. Mai hasn't come back to her village for 11 years.

2. Mr. Bean has played the violin since he was a student.

3. How long has he bought that house?

4. He hasn't written to her for years.

5. Nam has lived in Ca Mau since he was a child.

6. Minh hasn't gone for a holiday for two years.

7. Nick has joined a golf club for a year.

8. I have studied English for three weeks.