e. a preposition, "outside" plus its object, "the door". Cup cake Take the dog outside.
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Cup cake'There was a noise outside the door.'"outside" is a preposition here as "outside the door" is a prepositional phrase, i.e. a preposition, "outside" plus its object, "the door".
Cup cakeTake the dog outside."outside" is an adverb here modifying the verb "Take" in that imperative sentence.