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sinCE与什么时态搭配

since,副词 adv(常用于现在完成时或过去完成时),介词(常用于现在完成时或过去完成时).since后面从句用一般过去时.例:I've made great progress in English since I came to this school.自从我来到这个学校以来;我在英语上取得了

一、since通常通常搭配的时态 当since表示“自从”时,不管它是用作介词、连词还是副词,它通常都要与现在完成时连用.如:I've worn glasses since my childhood. 我从小就戴眼镜.The works have been closed since January. 一月份以来

完成时

since前(即主句)用( 现在完成)时态,后(从句)用(一般过去时)时态 如 He has worked here since he came to China.******************************************************************* 加油!不明白再问!如果帮到你,请及时采纳,谢谢!*******************************************************************

since后面跟【过去的时间点】,句子时态用【现在完成时】.since后面也可以跟【从句】,从句时态用【一般过去时】,主句时态用【现在完成时】.for后面跟【时间段 】_,句子时态可用【现在完成时】,也可以用【一般过去时 】等多种时态

since的四种用法 1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six). I have been here since 1989. 2) since +一段时间+ ago I have been here since five months ago. 3) since +从句 Great changes have

since引导的时间状语从句,主句一般用现在完成时态.

since的四种用法(***)1)since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six).例如:I have been here since 1989. 1989起,我一直在这儿.2)since +一段时间+ ago.例如:I have been here since five

since后的从句用一般过去时.2.如since如果解释为“自从.以来”,引导时间状语从句时,则其前面的主句用现在完成时. 3.其后如果是从句则用一般过去时,引导时间状语(从句)时:其后的从句用一般过去时(其前面的主句用现在完成时.

一般过去时. 1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six). I have been here since 1989. 2) since +一段时 I have been here since five months ago. 3) since +从句 Great changes have taken place

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