11. Samuel has kept a diary since 1997.
12. We have learned English for five years.
13. I have lived in Ho Chi Minh city since when I was 8.
14. She started teaching the children in this remote village five months ago.
15. The last time he wrote to me was April.
16. She last had a swim five years ago.
17. They haven't talked to each other for two months.
18. She hasn't seen her elder sister since 1999.
19. It's years since she last wrote to me.
20. It's ten years since Robert and Catherine married.
~ Chúc bạn học tốt ~
