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 + P2P2 + 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 + P2P2 + for + khoảng thời gian 

== S + didn't + V1V1 + 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.