摘要：3 原因状语从句 比较:because, since, as和for 1) because语势最强.用来说明人所不知的原因.回答why提出的问题.当原因是显而易见的或已为人们所知.就用as或 since. I didn't go, because I was afraid. Since /As the weather is so bad, we have to delay our journey. 2) 由because引导的从句如果放在句末.且前面有逗 号.则可以用for来代替.但如果不是说明直接原因.而是多种情况加以推断.就只能用for. He is absent today, because / for he is ill. He must be ill, for he is absent today.

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