because:因为.表直接原因,回答why的提问;一般放在主句之后,也可单独存在. because of:后面只能跟名词性的词语. because+句子 because of+名词 判断断语还是句子的标准： 单独取出because或because of的内容，如果有动词（也就是谓语）的是句子，如果没有则是断语。 例如：I didn't go to school because i am ill. am是谓语（动词） I didn't go to school because of my illness. my illness是短语（名词） 分析： I love you not because of who you are but because of who i am when i am with you. are和am是谓语，所以不能用because of,只能用because。
