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sinCE

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 months

since可以是介词后面加名词,一般都是过去的事,句子的谓语用现在完成时.如I have lived here/have been living here since 1990. He has been reading since breakfast.也可以是连词,后面接过去时的句子,主句也用现在完成时,因此我们可以说since是现在完成时的标志.如 He has taught here /has been teaching here since he graduated from colleage.此外还有ever since.since then.主干都是现在完成时.

since的用法主要有两点:一是表示“自从……以来”,二是表示“既然”之意.但如果只了解词的含义,而不了解其用法,在使用时就会造成错误.例如:I have not heard from him since I lived in Shanghai. 不少人会望文生义,将该句译为:“

这是我的教案,供你参考: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

一、若since引导的状语从句的谓语动词是终止性的过去时,则从句表示的时间是“从动作开始的那一时刻起”.如: He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力. We have been missing them

"since"的5种用法: 1.since+过去某时间点[指具体的年,月,日,时,星期几等] eg:he has beeb here since 1999 2.since+一段时间+ago eg:ha has been here since 5years ago 3.since+一般过去时的从句 eg:many things have changed since you left 4.it is/has been +一段时间+since+从句 eg:it is 2 years since i came here 5.it is +some time+since+从句 表示"自从以来,已经时间了"

“since”引导原因状语从句时,作为连词,译为:因为;既然;鉴于.例句:Since he was lazy,he didn't finish his homework.(由于他懒惰,他没有完成家庭作业.) 关于”since“的其它用法总结:一.Since作为介词,后接某一确定的时间

since 用法小结 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

一般来讲,since用于大家都知道或明确的原因,起强调作用;而because则用于大家所不知道的原因,表告知.

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