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The expression due to has two uses, one formal and one informal.
In formal writing and speaking, due is used as an adjective. It normally acts as the subject complement after a linking verb. Be due to means result from:
In informal contexts, due to has become a compound preposition equivalent to owing to; it is used to introduce an adverb phrase. This usage is not yet fully accepted in formal writing and speaking. For that reason, for an adverb phrase in formal writing, you may prefer to use owing to, because of or on account of instead.
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