2012年大学英语六级语法精要：动词（时态）

会计考友

2012年大学英语六级语法精要：动词（时态）
5 s5 p& [; |6 X, `1 Z5 S% a1)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.
9 I4 Y' V& |# N, ]6 P　　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
3 z" g1 Q) D; ^$ q- b　　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
4 V8 m0 d- \8 W( w1 {8 N　　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.
0 ~7 ~' n. s. e' @0 @7 Y% X, I! G　　In another month’s time she’ll have been studying here for three years.
+ Z1 |, g+ U3 e　　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.
　　I shall have finished this one before lunch.
  W1 \' w/ g' T4 z. \　　They’ll have hit the year’s target by the end of October.