7 My father has given up smoking since last year. 

Cấu trúc : S + started + to-V/V-ing + thời điểm trong quá khứ 

`=` S + have/has + $P_2$ + since + thời điểm trong quá khứ 

8 They started to work in that factory in 2001. 

9 Lan didn't write to Maryam a month ago. 

Cấu trúc : S + hasn't/haven't + $P_2$ + for + khoảng thời gian 

`=` S + didn't + $V_1$ + khoảng thời gian + ago.

10 He started living in Ha Noi when he was 12. 

11 I didn't meet her a long time ago. 

12 How long ago did you start learning English ? 

13 When did you buy this car ? 

14 How long have you listened to classical music ? 

15 I haven't seen her for 10 years. 

7. My father hasn't smoked since last year.

8. They started working in that factory in 2001

9. Lan didn't write to Maryam a month ago

10. He started living in Hanoi when he was 12

11. I didn't see her a long time ago

12. How long ago did you start learning English?

13. When did you buy this car?

14. How long have you listened to classical music?

15. I haven't seen her for 10 years