since,because,because of辨析一下三个词

I went back not because of the rain,but because I was tired.because of是最好区分的,词性与其他三个有些不同,只能跟名词或名词短语.because是连词,所以后边跟句子 ,因果关系比较强,能用来回答“why”for1.介词,(表示原因)因为,由于,作为…的结果I'm pretty angry with you for not telling me.由于你没有告诉我,我对你很生气.2.连词,因为,由于Prepare to alight,for we are almost there.我们马上要到了,准备下车吧.since因为; 既然; 由于,一般用于句首Since it is late I shall go home now.由于时间晚了,我现在要回家了.