①词性不同。Because是连词，后接原因状语从句或对以why开头的问题的回答；because of是复合介词，后面跟名词、代词、动名词或者what引导的名词性从句。②用法不同。because所引导的从句除用作原因状语外，还可用作表语； because of...短语通常做状语，但是在主语是代词的情况下，也可以用 because of...短语作表语。
一、because举例（后接有主谓宾的完整短句）
1. I took my umbrella because it was raining.
翻译：我带了伞因为天下雨了。
2. You are good to me because you love me.
翻译：你对我好是因为爱我。
3. The kitten was happy because it got the fish.
翻译：小猫很高兴因为它得到了鱼。

4. He walks slowly because he is old.
翻译：他走得慢因为他已经老了。
5. I like candy because it is sweet.
翻译：我喜欢糖果因为它是甜的。
二、because of举例（可接代词、名词、what从句等，但不可接that从句）
1. I do these things because of you.（接代词）
翻译：我做这些事是因为你。
2. The bird came here because of the princess.（接名词）
翻译：小鸟因为公主而来到这里。
3. He didn’t come because of his illness.
翻译：他因病没来。

4.It is just because of money.
翻译：那只是因为钱的原因。
4. He knew she was crying because of what he had said. （接what引导名词性从句）
翻译：他知道她哭是因为他说的话。
because和because of的用法有什么区别 扩展
两者都是因为，意思相差不大，主要不同两者用法不同，前者是连词，连接句子；后者相当于介问，连接的是名词、动名词或者代词。
