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11.14 延续动词与瞬间动词

    1) 用于完成时的区别
      延续动词表示经验、经历; 瞬间动词表示行为的结 果,不能与表示段的时间状语连用。
       He has completed the work.  他已完成了那项工作。 (表结果)
       I've known him since then.   我从那时起就认识他了。(表经历)

    2) 用于till / until从句的差异
       延续动词用于肯定句,表示"做……直到……" 瞬间动词用于否定句,表示"到……,才……"
       He didn't come back until ten o'clock.
        他到10 点才回来。
       He slept until ten o'clock.     
        他一直睡到10点。
     
    典型例题
    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. 首先本题后句强调对现在的影响,我知道她的模样,你不用描述。再次,several times告知为反复发生的动作,因此用现在完成时。

    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. 等待的动作由过去开始,持续到现在,应用现在完成时。

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