比較：because, since, as和for

　　1)　because語勢最強，用來說明人所不知的原因，回答why提出的問題。當原因是顯而易見的或已為人們所知，就用as或 since。

　　I didnt go, because I was afraid.

　　Since /As the weather is so bad, we have to delay our journey.

　　2)　由because引導的從句如果放在句末，且前面有逗 號，則可以用for來代替。但如果不是說明直接原因，而是多種情況加以推斷，就只能用for。

　　He is absent today, because / for he is ill.

　　He must be ill, for he is absent today.