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1. Samuel has kept a diary since 1997.
2. We have learned English for 5 years.
3. I have lived in Ho Chi Minh city since I was 8.
4. She started to teach the children in this remote village five months ago.
5. The last time he wrote to me was in April.
6. She last had a swim  five years ago.
7. They haven't talked to each other for two months.
8. She hasn't seen her elder sister since 1999.
9. It's years since she wrote to me.
10. It's ten years since Robert and Catherine got married.
11. They have cleaned their room for two weeks.
12. John has had his hair cut for over six months.
13. When did you start to ride a bicycle?
14. When did he start to write to you?
15. How long is it since he last talked to you?
16. How long is it since you last telephoned him?
17. It's the first time we have eaten this kind of food.
18. I have never seen this film before.

19. He hasn't gone abroad before.