since 和 as 引导原因状语从句时,有什么区别?

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since 和 as 引导原因状语从句时,有什么区别?
since 和 as 引导原因状语从句时,有什么区别?

since 和 as 引导原因状语从句时,有什么区别?
as,because,since都可以表示因果关系,连接原因状语从句,含义是"因为,由于",但它们有区别:because表示的语气最强;as一般放在句首,语气较弱,较口语化;since常常用在书面语中,表示多为对方已知的、或稍加分析便可得知的原因,有时可译作"既然".例如:
(1) He will succeed because he is in earnest.他一定会成功,因为他很认真.
(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握,他会相信你的.
(3) As rain has fallen, the air is cooler.因为下过雨,空气比较清爽.

since和as是从属连词,说明的是已为人们所知和理由。since的语气比because弱,但比as强。since和as引导的从句一般放在句子的开头。
Since he was busy, he didn't come.
他因为忙,所以没来。
As I have a day off today, I'll write to you.
因为我今天有一天假,所以...

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since和as是从属连词,说明的是已为人们所知和理由。since的语气比because弱,但比as强。since和as引导的从句一般放在句子的开头。
Since he was busy, he didn't come.
他因为忙,所以没来。
As I have a day off today, I'll write to you.
因为我今天有一天假,所以就给你写信。
此外,since也可以述说推断的理。如:
It must have rained, since the ground is wet.
一定下过雨,因为地是湿的.

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