for(因为)的用法: for是并列连词,表示推断的原因,或对前一分句补充说明理由. 例:It must be morning for the birds are singing.一定是清晨了,因为鸟儿在叫. because (因为)的用法: because通常表示直接的原因.because引导的从句表示直接而明确的原因和理由,表示按因果关系的推断,语气很强,用来回答why的问题,一般位于主句之后. 例:We couldn't go out because it was too cold.因为天气太冷,我们不能外出.
because引导有因果关系的句子。e.g.I didn't pass the final examination because I don't work hard at other times. for表示解释说明。 My clothes is wet for it rained just now.