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1、词性不同
because 是连词，其后接句子；because of 是复合介词，其后接名词、代词、动名词、what 从句等。如：
I didn’t buy it because it was too expensive. 我没有买是因为它太贵了。
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He is here because of you (that). 他为你(那事)而来这里。
2、搭配不同
because 所引导的从句除用作原因状语外，还可用作表语。而复合介词 because of 所引导的介词短语通常用作状语而不用作表语。
It is because he loves you. 那是因为他爱你。
His absence was due to the rain.