1. They have built this house for 2 months.
2. My father has worked in this factory since last week.
3. He has lived in Ho Chi Minh City since he was 8.
4 He has learnt English since he was 18.
5. They began working in that factory 5 years ago.
6. We started learning English 4 years ago.
7. My father has given up smoking since last year.
8. They started working in that factory since 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 learn French ?
13. When did you buy this car /
14. How long have you started listening to classical music ?
15. I haven't seen her for 10 years.
