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Australian manual of scientific style Start communicating effectively
Because is used as both a conjunction and a preposition to express causation:
They cut the program because time had run out. [conjunction]
They cut the program because of time running out. [compound preposition]
Due to is sometimes used to replace because of as a compound preposition that expresses causation. However, traditional grammarians argue that due to should only be used as an adjective:
Cutting of the program was due to time running out. [adjective]
Unlike because, due cannot be used as a simple conjunction.