because是连词,所以后边跟句子
because of后边加名词或者动名词短语
He came to work late because he got up late.
He came to work late because of getting up late.
用法上because 后加上一个句子 We won\'t go there because it\'s going to rain.
而because of除了\"因为\"外,还有\"thanks to\" 的意思,后加上一个词，或短语
We won\'t go there because of rain.
We won\'t go there because of the bad weather.
