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按照传统语法，due to主要引导表语，because of主要引导状语。due to也可用来引导状语，而owing to也可以用来引导表语。because of通常只用来引导状语，若引导表语，主语通常应为代词。
Due to和because of区别
均可表示“由于”、“因为”，按照传统语法：due to主要引导表语，而because of主要引导状语。如：
His illness is due to bad food. 他生病是由于吃了不好的食物。
The accident was due to careless driving. 这次车祸起因于驾驶疏忽。
He can’t come because of the bad weather. 他不能来是因为天气不好。
但是在现代英语中，due to也可用来引导状语。如：
由于交通拥挤他迟到了。
正：He was late due to [owing to, because of] the very heavy traffic.
正：Due to [Owing to, Because of] the very heavy traffic, he was late.
because of 通常只用来引导状语，若引导表语，主语通常应为代词。如：
It is all because of what you said. 那完全是因为你说的话。
because of 和 due to
because of 和 due to两个词虽然在中文可能都会翻成「因为」，词性也都是介词，但是其实他们的用法却是不一样的，不可以随便替换，会造成语法错误！
because of 前面必须是有一般动词的完整句子，而 due to 前要有名词，不能是一般动词（be 动词不是一般动词，be 动词是系动词），因为 due to 本质上是用来说明、形容名词的。