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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