I . Rewrite the sentences
1. We have learned English for 7 years
=> We started ........................................
2. Mr. Ba started to give up smoking last year
=> Mr. Ba has .......................................
3. Lien hadn't written time for a month
=> Lien didn't ....................................
4. He has lived in Ha Noi since he was 10
=> He started .................................................
5. How long have you studied vietnamese ?
=> How long ago ................................