1. It's the first time we have seen the car (S + have/has + not + p.p + before = This/It + is the first time + S + have/has + (ever) + p.p)
2. It's the first time I have gone there
3. It's the first time they have performed here
4. It's the first time Nam has held a girl’s hand
5. It's the first time Duy has read this kind of story
6. She has danced for ten years (True)
7. They have smoked for 20 years (for + khoảng thời gian: HTHT = khoảng thời gian + ago: QKĐ)
8. Mr. Doone has worked here since he graduated (when/in + mốc thời gian: QKĐ = since + mốc thời gian: HTHT)
9. The nice girl has danced since 1990
10. We have been studying English since we were too young
11. When did you learn English? (How long + HTHT = When + QKĐ)
12. When did you paint the door?
13. When were you jogging?
14. How long have you spoken Cambodia?
15. How long have you listened to Big Bang?
16. Samuel has kept a diary since 1997
17. We have learnt English for fìve years
18. I have lived in Ho Chi Minh City since I was 8
19. She started teaching/ to teach the children in this remote village five months ago (start doing s.th/ to do s.th)
20. When did you ride a bicycle?