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      11.14 延續(xù)動詞與瞬間動詞
      ?
      1) 用于完成時的區(qū)別
         延續(xù)動詞表示經(jīng)驗、經(jīng)歷; 瞬間動詞表示行為的結 果,不能與表示段的時間狀語連用。
         He has completed the work.  他已完成了那項工作。 (表結果)
         I've known him since then.   我從那時起就認識他了。(表經(jīng)歷)

      2) 用于till / until從句的差異
         延續(xù)動詞用于肯定句,表示 "做……直到……" 瞬間動詞用于否定句,表示"到……,才……"
         He didn't come back until ten o'clock.
           他到10 點才回來。
         He slept until ten o'clock.     
           他一直睡到10點。
       
      典型例題
      1. You don't need to describe her. I ___ her several times. 
      A. had met B. have met  C. met D. meet
        答案B. 首先本題后句強調(diào)對現(xiàn)在的影響,我知道她的模樣,你不用描述。再次,several times告知為反復發(fā)生的動作,因此用現(xiàn)在完成時。

      2.---I'm sorry to keep you waiting.
        ---Oh, not at all. I ___ here only a few minutes.
      A. have been  B. had been  C. was D. will be
        答案A. 等待的動作由過去開始,持續(xù)到現(xiàn)在,應用現(xiàn)在完成時。













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