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果 ) I’ve known him since then. 我從那時起就認識他了。 (表經歷 ) since 用來說明動作起始時間 — “自從 ……” for用來說明動作延續(xù)時間長度 — “長達 ……” I have lived here for more than twenty years. I have lived here since I was born. My aunt has worked in a pany since 1949. I have not heard from my uncle for a long time. 比較 since和 for 注意:并非有 for 作為時間狀語的句子都用現在完成時 I worked here for more than twenty years. (我現在已不在這里工作。 ) I have worked here for many years. (現在我仍在這里工作。 ) He has gone to Shanghai. 他 (已經 )去上海了。 He has been to Shanghai. 他 (曾經 ) 去過上海。 比較 have/has been to have/has gone to He went to Shanghai last week. 他 (曾經 )到 /去過上海 [在他人生中曾經有過這樣的經歷 ,但他人現在肯定不是在上海而是回來了 ] 他已經 去上海了 [也許剛動身出發(fā) ,也許已經到了 ,也許還在路上 ,反正他人不在這里 ] 上周他 [做了一件事 :那就是 ]去了上海 He has been to Shanghai. He has gone to Shanghai. He has been in Shanghai for 10 years. 他 呆在上海迄今為止已經 10年了 [現在還在上海沒有離開呢 ] He lived in Shanghai for 10 years. 以前他 在上海住過 10年 [現在不在上海了 ] 辨析這些句子 由時態(tài)導致的