How do infinitive phrases function in sentences?

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How do infinitive phrases function in sentences?

Infinitive phrases function in sentences as noun phrases, adjective phrases, or adverbial phrases.

As noun phrases, infinitive phrases can act as the subject of a sentence, the object of a verb, or the object of a preposition. For example: "To swim in the ocean is my favorite activity." (subject), "I want to learn how to play the guitar." (object of a verb), "She has a desire to travel the world." (object of a preposition).

As adjective phrases, infinitive phrases modify nouns or pronouns in a sentence. For example: "I have a book to read." (modifying the noun "book"), "He is the person to ask for help." (modifying the pronoun "person").

As adverbial phrases, infinitive phrases modify verbs, adjectives, or adverbs, providing additional information about time, purpose, or result. For example: "She woke up early to catch the train." (modifying the verb "woke up" to indicate purpose), "He was too tired to continue." (modifying the adjective "tired" to indicate result), "She spoke softly to avoid waking the baby." (modifying the adverb "softly" to indicate purpose).