延续动词与瞬间动词(在线收听

   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。
  原文地址:http://www.tingroom.com/listen/vocabulary/384510.html