since,for,during,in,at,on

since,for,during,in,at,on在时间上的用法区别

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1、since作介词时,后接表示过去时间点的名词、代词、动名词；作连词时,后接一般过去时的从句；在含有since的句子,谓语动词用现在完成时.例：Since last seeing you ,I have been ill.I have been studying English s...