Is an infinitive phrase?

"An infinitive" is not a phrase. It's a single word or set of words that functions as a noun, adjective, or adverb.

Here's the breakdown:

* Infinitive: The basic form of a verb, often preceded by "to" (e.g., "to sing," "to run," "to eat").

* Infinitive Phrase: An infinitive plus any modifiers or complements. It acts as a single unit within a sentence.

Examples:

* Infinitive: "to fly"

* Infinitive Phrase: "to fly a kite in the park"

Infinitive phrases can function as:

* Noun: "To fly a kite is fun." (Subject of the sentence)

* Adjective: "I have a desire to fly a kite." (Modifies the noun "desire")

* Adverb: "I went outside to fly a kite." (Modifies the verb "went")

Let me know if you have any other questions!