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What is a preposition and what does it modify?
A preposition is a word or group of words that combines with a noun or pronoun to form a phrase.
A preposition alone does not modify.
However, when it is combined with a noun or pronoun to form a prepositional phrase, the phrase can act as adjective (modifying a noun/pronoun), or adverb (modifying a verb, an adjective, or another adverb). A prepositional phrase can also act as a noun.
Examples:
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The child ran across the street. The preposition "across" does not modify anything. However, the prepositional phrase "across the street" acts as adverb to the action "ran". Ask: Where did the child run? Ans: across the street
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The man beside my aunt is my uncle. The preposition "beside" does not modify anything. However, the prepositional phrase "beside my aunt" acts as adjective modifying the noun "man". Ask: which man? Ans: man "beside my aunt"