2012年大学英语六级语法精要：动词（时态）

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2012年大学英语六级语法精要：动词（时态）
8 v5 M5 h8 t8 m" K" [" Q; j1)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.
  r: {0 J; b5 c2 m. A　　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.www.examｗ.com
- ^; G+ ]! x, Y+ S　　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): 将来某时会业已发生的事.
- N7 |& a5 z7 G　　I shall have finished this one before lunch.
　　They’ll have hit the year’s target by the end of October.