as,for ,because都表示因为时,用法怎么区分答:注:because后接句子,而because of后接短语. Since everyboby is here,let's begin our meeting. 既然大家都到了,那就开始开会吧. Day breaks,fro the birds are singing. 因为鸟儿在唱歌了,天可能亮了. As he was not well,i decided to go without him. 由于他身体不太好,我决定不带他去. because ,...