1. I had had this computer for 3 years.

2. They have lived in Da Lat since last year. 

3. She has been happy since she had the mobile phone.

4. We have learnt French for a month.

5. She has worked in this school since 2012.

6. I have used computers for 5 years.

7. The washing machine has stopped working since this morning.

8. They have known her for a long time.

9. He has read this novel since 9 o'clock.

`1.` I have had this computer for 3 years.

`2.` They have lived in Da Lat since last year.

`3.` She has been happy since she had the mobile phone.

`4.` We have learned French for a month.

`5.` She has worked in this school since 2012.

`6.` I have used this computer for 5 years.

`7.` The washing machine has stopped working since this morning.

`8.` They have known her for a long time.

`9.` He has read this novel since 9 o'clock.

Giải thích cấu trúc thì hiện tại hoàn thành :

`+)` S + have/ has + Vpp

`-)` S + have/has not + Vpp

`?)` Have/ has + S + Vpp ?

Phân biệt since và for

For + khoảng thời gian

Since + mốc thời gian