1. Nam started studying English 5 years ago → Nam has been studying English for 5 years.
2. We started to play soccer an hour ago → We have been playing soccer for an hour.
3. She started reading this novel a week ago → She has been reading this novel for a week.
4. He started writing this book last year → He has been writing this book since last year.
5. My sister began playing badminton in 1986 → My sister has been playing badminton since 1986
6. Hoa began playing piano when she was ten → Hoa has been playing the piano since she was ten.
7. Mr. Hai began to be a doctor when he was 21 → Mr. Hai has been a doctor since he was 21
8. Hung stopped playing soccer last year → Hung hasn’t been playing soccer since last year.
9. I stopped smoking 2 years ago → I haven’t been smoking for 2 years.
10. She stopped writing when she moved to England → She hasn’t been writing since she moved to England.
11. My brother stopped working in this factory last month → My brother hasn’t been working in this factory since last month.
12. Maria stopped planting flowers 10 years ago → Maria hasn’t been planting flowers for 10 years.
13. Ba started building this hotel a year ago → Ba has been building this hotel for a year.
14. She stopped playing volleyball a year ago → She hasn’t been playing volleyball for a year.
15. We began listening to music at 4 pm → We have been listening to music since 4 pm.
16. I left there last month → I haven’t been there since last month.
17. When did you live here? How long?
18. When did you know her? How long?
19. How long have you written this book? When?
20. Ba has worked in this factory since he was 18 → Ba started working in this factory when he was 18