英语四级考试复习必备语法知识(5)(在线收听

   非谓语动词

  不定式
  形式
  主动形式 被动形式
  一般式 to do to be done
  完成式 to have done to have been done
  进行式 to be doing
  完成进行式 to have been doing
  完成式: 不定式的一般形式所表示的动作, 通常与主要谓语表示的动作(状态)同时(或几乎同时)发生, 或是在它之后发生. 假如不定式所表示的动作, 在谓语所表示的动作(状态)之前发生, 就要用不定式的完成式。
  I am glad to have seen your mother (= I am glad I have seen your mother).
  (比较: I am glad to see you.)
  He is said to have written a new book about workers.
  He pretended not to have seen me.
  进行式: 如果主要谓语表示的动作(状态)发生时, 不定式表示的动作正在进行, 这时要用不定式的进行式。
  You are not supposed to be working. You haven't quite recovered yet.
  We didn't expect you to be waiting for us here.
  He pretended to be listening attentively.
  完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.
  The struggle was known to have been going for twenty years.
  We are happy to have been working with you.
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