City University of Hong Kong CLASS CLASS
Making Sense of Grammar
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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) | 105 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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