as since - for because的區別

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as since for because的區別

because, as, since, for 表示原因的用法區別

1、 because 是這四個詞中最常用的,也是語氣上最強的一個詞,而且它可以用於回答 why 引領的提問,其他的詞則不可以。We're worried because three members have quitted the job. 

2、 since 語氣上比較弱一些。表達的意思與 because 也有細微差別,多用於表示已知的,顯而易見的理由。Since we were in the area, we'd stop by and see them. 

3、&nbspas 語氣上也是比較弱的。使用 as 表達“因為”是比較正式的用法。As she wasn't there I left a message for her.

4、 for ,其作用是作為一個輔助詞引出補充説明的原因。for 作為連詞時只能置於主句之後,且必需有逗號隔開。I believed her,for surely she would not lie to me.

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