14.They have worked in that factory since 2001.

-->They started........................................................................................................

15. Lan hasn't written to Maryam for a  month.

-->Lan didn't..........................................................................................................

16. He has lived in Ha Noi since he was 12.

-->He started..........................................................................................................

17. I haven't met her for a long time.

-->I didn't...............................................................................................................

18. How long have you learnt French?

-->How long ago...................................................................................................?

19. How long have you bought this car?

-->When did...........................................................................................................?

20. When did you start to listen to classical music?

-->How long ..........................................................................................................?

21. I saw her 10 years ago.

-->I haven't...............................................................................................................

22. The last time I saw him was in June

--> I ………………………………………………………………………………..

23. He started working in this company 5 years ago

--> He has……………………………………………………………………………

24. They began living here ten years ago.

--> They have……………………………………………………………………………

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