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

------------------------------------------------------------------

1. There is a bookshop opposite the library.

There is + a/an + N số ít 

2. She became a member of the Peace Corps two years ago.

3. It has been ten years since he last donated blood.

4. He has worked for this non-profit organisation for five years.

5. This is the most interesting experience he has had.

6. I started working as a volunteer three years ago.

7. She hasn't written to me since she moved to another city.

8. They haven't cleaned this room for a week.

9. He hasn't called me since July.

10. I last met him a long time ago.

`color{orange}{~MiaMB~}`