因为；因为

because;because of二者均表示“因为”，区别是：　　because是从属连词引导原因状语从句;而because of是一个合成介词，其后接名词、代词、动名词或what从句组成介词短语。如:　　I went back not because of the rain,but because I was tired.我回去不是因为下雨，而是因为我累了。　　Her face turned red because of what he said.他的话使她脸红了。