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1、because 表示“由于，因为”，是连词，后接从句。比如:
She doesn't go to school because she is ill.
她没来上学因为她生病了。
The boy was always late because it took so long to get dressed.
这个男孩因花太长时间穿衣服总是迟到。
I can't do it now because I am busy.
因为我正忙着，现在不能做此事。
2、because of 是介词，后接名词、代词、动词的ing形式，或者名词性从句。比如:
She doesn't go to school because of her illness.
We should never look down upon a person because of what his parents have done.
我们不应该因为一个人的父母所做的事而看不起他本人。