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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
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Mar 11, 2019
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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
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Mar 14, 2019
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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
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