四级考试常用语法精选(4)

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四级考试常用语法精选(4)

  to do

  完成式

  to have been done

  to be doing

  完成进行式

  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之前发生, 就要用不定式的完成式.

  I am glad to have seen your mother .

  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 havent quite recovered yet.

  We didnt 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.