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4. Lan hasn't written to Maryam for a month
→ Lan didn't
5. He has lived in Hanoi since he was 12
→ He started
6. I haven't seen her for a long time
→ I didn't
7. How long have you learnt French?
→ How long is.
8. When did you start to listen to classical music
→ How long .
9. I last saw her 10 years ago
→ I haven't .
10. How long is it since you bought this car?
→ When did .
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