1. We have learnt Englist for 4 years
=> We started ....................................................................
2. My father started to give up smoking last year.
=> My father has ....................................................................
3. They have worked in that factory since 2001.
=> they started ....................................................................
4. Lan hasn't written to Maryam for a month.
=> Lan didn't ....................................................................
5. He has lives in Hanoi since he was 12.
=> He started ....................................................................
6. I haven't seen her for s long time.
=> I didn't ....................................................................
7. How long have you learnt French?
=>How long ago ....................................................................?
8.When đi you start to listen to classical music?
=> How long ....................................................................?
9. I last saw her 10 years ago.
I haven't ....................................................................
10. How long have you bought this cat?
=>When did ....................................................................?