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标题: because、as、for、since具体怎么区别 [打印本页]

作者: leenyao    时间: 2011-3-20 17:16     标题: because、as、for、since具体怎么区别

本帖最后由 leenyao 于 2011-3-20 17:18 编辑

because,since,as,for
because/since/as/for这四个词都是表示原因或理由的连接词,但是as,because,since是从属连词,引导原因状语从句,for是并列连词,所引导的不是原因状语从句,而是表示理由的对等句子,是对前面所讲内容补充和说明。在语气上由强至弱依次为because→since→as→for。because引导的从句多置于句末,表示直接的原因或理由,表示产生那种结果的必然的因果关系,在回答why的提问时,必须用because作答。
如:We stayed at home because it rained.因为下雨我们呆在家里。
as与since引导的从句多置于句首,不过as表示十分明显的原因,只说明一般的因果关系,可译为“因为、由于”;而since则表示稍加分析、对方已知的原因,一般可译为“既然”。如:
As he was not feeling well,I decided to go there alone.由于他身体欠佳,我决定独自去那里。
Since everyone is here,let';s start.既然大家都到了,咱们就开始吧。
for引导的分句一般放在句末,其前用逗号,它所叙述的理由是间接的,即推测性理由,或是对前面叙述的事实或看法的补充说明。如:
There must be nobody in the classroom,for the light is off.教室里一定没有人,因为灯灭了。(推测性理由)


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作者: leenyao    时间: 2011-3-20 17:19

because 表示直接的原因,如:Because the electricity was cut off,the light went out.
as 可表示因果关系,单不如because 的因果关系那么强烈 ,如: As he was ill, he didn';t come to school.
since 表示原因时,说话人并没有提供新的信息,而because 和as提供的是新的信息,如:Since you can';t answer my question, i will ask somebody else.
Since you have come here, you should wait until he comes back.
for表示原因时,是并列连词,仅仅是补充说明,如:
It is morning now, for the birds are singing.
Electricity must have been cut off , for the light went out.
作者: evaxiaofan    时间: 2011-3-21 14:41

回复 2# leenyao


    oh,i see~~
作者: Sanmal    时间: 2011-3-21 20:03

really nice!
GJ
作者: leenyao    时间: 2011-3-21 20:54

回复 4# Sanmal


    thank you very much




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