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2014年6月大学英语四级语法冲刺:动词

2014-05-29 阅读 :
  动词(时态,语态,用法,省略,一致性等)
  时态
  1)现在完成进行时态 (have/has been + -ing 分词构成): 动作或状态从过去某时开始,继续到现在,可能继续下去,也可能刚刚结束.
  I’ve been writing letters for an hour.
  I’ve been sitting in the garden.
  2)过去完成进行时(由had been + ing分词构成): 过去某个时刻以前一直在进行的动作
  I’d been working for some time when he called.
  We had been waiting for her for two hours by the time she came.
  3)将来完成进行时: 将来某个时刻以前一直在进行的动作.
  By next summer, he will have been working here for twenty years.
  In another month’s time she’ll have been studying here for three years.
  4)将来完成时(由shall/will have + 过去分词构成): 将来某时已发生的事.
  I shall have finished this one before lunch.
  They’ll have hit the year’s target by the end of October.

本文标题:2014年6月大学英语四级语法冲刺:动词
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