Read the sentence.In a feeding frenzy, the pigeons descended upon the breadcrumbs that the kindly old man on the park bench continued to toss.

“On the park bench” describes which old man is tossing the breadcrumbs, so the prepositional phrase acts adjectivally by modifying the noun “man.” “In a feeding frenzy” is also a prepositional phrase, but it acts adverbially by describing how the pigeons descended. “To toss” is an infinitive phrase, not a prepositional phrase.

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