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for because的区别,as since

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as since for because的区别

because, as, since, for 表示原因的用法区别

1、 because 是这四个词中最常用的,也是语气上最强的一个词,而且它可以用于回答 why 引领的提问,其他的词则不可以。We're worried because three members have quitted the job. 

2、 since 语气上比较弱一些。表达的意思与 because 也有细微差别,多用于表示已知的,显而易见的理由。Since we were in the area, we'd stop by and see them. 

3、&nbspas 语气上也是比较弱的。使用 as 表达“因为”是比较正式的用法。As she wasn't there I left a message for her.

4、 for ,其作用是作为一个辅助词引出补充说明的原因。for 作为连词时只能置于主句之后,且必需有逗号隔开。I believed her,for surely she would not lie to me.