Some words can be used as either prepositions or adverbs. If the word has an object, it is acting as a preposition. If it has no object, it is acting as an adverb.
Adverb: My school bus just went past. Preposition: My brother just drove past us.
Hint:
Ask what after the word to see if it has an object.
Adverb: My school bus just went past. (Past what? Nothing = Adverb) Preposition: My brother just drove past us. (Past what? Us = Preposition)
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