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8. He has been living in Ho Chi Minh city since he was 8. 9. He has learned English since he was 18. 10. They have been working in that factory for five years. 11. My father hasn't smoked for two years. 12. We have been learning English for four years. 13. My father has been giving up smoking since last year. 14. They have been working in that factory since 2001. 15. Lan didn't write to Maryam for a month. 16. He started living in Ha Noi when he was 12. 17. I haven't met her for a long time. 18. How long ago did you start learning French? 19. When did you buy this car? 20. How long have you been listening to classical music? 21. I haven't seen her for 10 years. 22. The last time I saw him was in June. 23. He has been working in this company for five years. 24. They started living here ten years ago. Note: Some of the answers may vary depending on the context and intended meaning of the sentences, but these are the most common interpretations based on the given information.