4. How long have you been a member of Be a Buddy? (join)
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5. This is the first time he has been to SaPa. (before)
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6. They have live here for ten years. (ago)
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4. How long have you joined Be a Buddy?
5. He has never been to Sapa before.
6. They started living here ten years ago.
4.How long have you joined Be a Buddy?
5.He has never been to Sapa before
6.They lived here ten years ago