ecause+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.