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since的用法: 一.Since作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。例如: 1、He left the village in 1982 and I haven’t seen him since then.1982年他离开这个村子...

since的用法:译作“自从…以来” (1)接时间点:如 I have stayed in that country since 1995. 要求:谓v.用现在完成时,而且须是延续性动词。 (2)接一段时间 + ago:如 They have lived in that house since two years ago. 要求:谓v.用现在完成...

since是“自从……以来”,所以表达的是过去的时间,跟过去时间点或者表达过去的从句(一般过去时),主句用现在完成时 by是“到……为止,在……以前”,如果后跟现在时间,句子用现在完成时;如果跟过去时间,句子用过去完成时。

since 和when 用法是不同的。 since 意为:自从,主要用于完成时态中,做完成时的时间状语。其后可跟短语,也可跟从句,若跟从句,要用一般过去式。 如:I have lived here since 1999. (跟短语) I have lived here since I found a job in th...

ever since和since区别: 1、ever since和since意思是一样的,用法有区别。 ever since后面可以不加任何东西,也可以加名词或者加从句。 2、since 可以放在句末,或者句首。 拓展资料 ever since 1、He's been there ever since you left! 自从...

since的用法:译作“自从…以来” (1)接时间点:如 I have stayed in that country since 1995. 要求:谓v.用现在完成时,而且须是延续性动词。 (2)接一段时间 + ago:如 They have lived in that house since two years ago. 要求:谓v.用现在完成...

It is + 段时间 + since... / It has been + 段时间 + since...表示“从……起已有多长时间了”。两句型意思相同, 前者是规范说法, 后者是口语说法。 用法:since从句中常用一般过去时,若从句中是持续性动词的一般过去时, 则表示该动作结束有多...

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. 基本概念...

由于二者均表示从某时间点开始,其动词的延续性及时态需进行认真的辨识: 1、前者无需考虑动词的延续性还是短暂性,都作“自从,或从…起”讲: I have got a few opportunities to catch up with my classmates ever since I was ill. 2、后者则必...

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 ...

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