:动词时态和语态重点讲解

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  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……"。例如：
  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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