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…………………………………………………………………………… giúp mình vớiiii