让我们零起点学英语原因状语从句

　　原因状语从句
 
零起点学英语比较：because, since, as跟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。当起因是不问可知的或已为人们所知，就用as或 since，零起点学英语例句如：
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，零起点学英语在这里我们则可能用for来代替。但假如不是说明直接原因，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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