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: 

S + has/have + V3/ed + for/since + time 

--> S + started / began + to V / Ving 

--> It is / has been + time + since + S+ V2/ed 

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1. He hasn't come to the cinema for three weeks.

2. The last time we went to the park was 2 days ago.

3. We haven't met each other for five years.

4. I have worked the job for six months.

5. They have checked the machines for two hours.

6. He has fixed the bike for ten minutes.

7. She has cooked the soup for half an hour.

8. We have done the test for an hour.

9. Jack has planted flowers for three hours.

10. They have built the bridge for two years.

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