How do phrases function in a sentence? Quite simply, a phrase as a whole functions as a single part of speech. Prepositional phrases function as adjectives and adverbs. Appositive phrases function as nouns renaming another noun or pronoun. Participle phrases function as adjectives. Gerund phrases function as nouns. Infinitive phrases function as nouns, adjectives, and adverbs. == See next page 1 There are 8 parts of speech: Noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection 3 of these parts of speech can be replaced by phrases: Nouns Appositive phrases Gerund phrases Infinitive phrases Adjectives Prepositional phrases Participle phrases Infinitive phrases 2 (**All adjective phrases modify nouns and pronouns. All adjective phrases tell “which one”, “what kind”, “how many”, “how much”, just like single-word adjectives do). Adverbs Prepositional phrases Infinitive phrases (**All adverbs and adverb phrases tell “how”, “when”, “where”, and “to what extent” about the words they modify. All adverb phrases can modify verbs, adjectives, and other adverbs, just like single-word adjectives do). 3