because for since都有因為的意思，但在用法上有什么區別，because for since都有因為的意思，但在用法上有什么區別，麻煩舉例說明，謝謝because， for， since，都有因為的意思，但在用法上有什么區別，麻煩舉例說明，謝謝

熱心網友

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 didn”t 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.

熱心網友

for 一般表示推斷理由, 即根據前邊的結果, 推斷原因,for所引導的不是充分必然原因,The ground is wet, for it must have rained last night.The day must be broken, for the bird s are singing.