1、首先，because的词性：连词。
2、because：conj.因为
派生词：prep. because of
3、because:表因为，强调直接造成某种结果的理由和原因。
4、例句用法：
He failed to arrive at the station on time because the traffic is busy.
因为路上交通拥挤，他没能准时赶到车站。
5、It is because he is honest that we like him.
正是因为他诚实，我们才喜欢他。
6、because of 后接名词或代词引导从句。
7、例句用法：
Many families break up because of a lack of money .
许多家庭由于缺钱而破裂。
It is because of his sickness.
这是因为他生病了。
