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 

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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1. It is a small armchair.

S + be + a/an + ADJ + N 

2. They have never played basketball before.

3. The last time she visited her aunt was 6 months ago.

4. They have drawn this picture since 2018.

5. I haven’t done my housework since June.

6. It is 4 years since we last watched TV.

7. The last time I saw my sister was 3 weeks ago.

8. I have not drunk apple juice since June.

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