1. He has been her when he was 12. -> he started............................ 2. Lan hasn't written to me for a month. -> Lan didn't.......................... 3. My father started to give up smoking last year. -> My father has...................... 4. When did you start to listen to classical music? -> How long................ 5. I last saw her 10 years ago. -> I haven't...................... 6. How long have you bought this car? -> When........................