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III. Rewrite these sentences .
1 .My sister began to learn English when she was six years old.
=> My sister has _______________.
2. I last saw Peter when he attended the school meeting.
=> I haven’t _______________.
3. Mr.Quyen began teaching Chinese ten years ago.
=> Mr.Quyen has _______________.
4. He has been studying English for six years.
=> He started _______________.
5. It’s nearly twenty years since my father last saw his brother.
=> My father hasn’t _______________.
6. He started learning Chinese five years ago.
-> He has _______________.
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