City University of Hong Kong CLASS CLASS
Making Sense of Grammar

In a clause guided by a coujunction such as when,before,after,until;what is the usage of the past completion aspect?

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在由when,before,after,until等连词引导的分句中过去完成体的用法
asked Mar 11, 2019 in Questions about English Grammar by 118070100218lh (450 points) | 219 views

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after用作连词时，它引导的时间状语从句如果具有将来意义，往往用一般现在时表示有时也用现在完成时，而不能直接用一般将来时
在以before开头的表示将来的分句中，要用现在式，或现在完成式
answered Mar 14, 2019 by 118030200311snd (820 points)
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与现在完成体“未完成”用法相仿，与现在完成进行体相仿，只是时间推移到了过去
answered Mar 14, 2019 by 118030200314lq (860 points)

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