Prepositions form phrases when they are followed by a noun or pronoun they relate to the rest of the sentence. These prepositional phrases can be added at the start of a sentence or inside it to add extra information. They act as adjectives or adverbs by describing a noun or a verb.
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Robert works at the local community college. (describes a verb → Where does he work?)
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The cat on the sofa belongs to him. (describes a noun → Which cat?)
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In the morning, I like to eat eggs.