It is five years __ they got married
a:when b:after c:since
本来条件反射想选C。但是想起老师说过。since通常和完成时态连用。结果选了b。。为啥是C呢?。。
since不只用在完成时态上。
since的用法:
1. 当since表示“自从”时,不管它是用作介词、连词还是副词,它都通常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.一月份以来这些厂就关闭了。
He’s put on a lot of weight since he gave up smoking.他戒烟后体重增加了许多。
Nothing has happened since. 从那以后未发生什么事。
She moved to London last May and has since got a job on a newspaper.她去年五月到伦敦 此后一直在报社工作。
有时连用现在完成进行时。如:
He has been working since noon.他从中午就开始工作了。
2. 在以下情况下可以连用除完成时态外的其他时态:
①当主句表示“多长时间”时,动词可用一般现在时(当然也可用现在完成时)。
如:
It’s a long time since I met you last.好久不见了。
It’s just a week since we arrived here.我们到这里才一个星期。
It’s a long time since I met you last.从上次见到你,已有很长时间了。
以上各句的it is也可换成 it has been,不过在口语或非正式文体中,用一般现在时的情形比较普遍。
②当主句谓语动词为seem, appear等连系动词时。
如:
It seems like years since we last met.我们似乎几年未见面了。
It seems like years since I last saw you.从上次见到你以来好像已经有许多年了。
③当主句和从句表示情况“变化”时。如:
She doesn’t come round to see us so much since her marriage.自从结了婚,她不怎么过来看我们了。(原来经常来,结婚后就不怎么来了)
Since he went on that course he thinks he knows everything.自从他选了那门课程,他就认为自己什么都懂了。(原来不认为自己什么都懂,但选了那门课程后就认为自己什么都懂了)
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 taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
所以说不一定光用于完成时态上
参考资料:百度
本回答被提问者采纳解译:since 引导一个时间状语从句时,其时态是随主句或整个句子的要求来确定的。换句话来讲,完成时态只是其多种时态用法中的一种而已。
例句:It is two years since she lived in the city.
但是只要意思顺畅 就可以选 不用怀疑自己