故原来的借borrow（短暂性动词）要变成持续性动词（keep）所以就有i have kept the book for two weeks.(我已经借了这本书两周了)如果改为同义，则是i borrowed the book two weeks ago.(我两周前借了这本书）
我借这本书已经有一个月了。I have kept this book for a month.
had owned this bike for 3 years.老实说我觉得用现在完成时更好. hadn't seen the cat for a long Green had taught English since 1998.
一般而言，英语措辞不会问“买多久”的。直接问 How long have you had this magazine?如果非要提这个“买”字，可以说 "How long ago did you buy this magazine?"
I have had this book for three months.第1个回答的同学，把month的复数写错了。 :-)
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berber1215
