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An infinitive phrase will start with the base form of a verb (e.g., to eat, to run) and function as a noun, adjective, or adverb. A prepositional phrase will begin with a preposition (e.g., in, on, at) followed by a noun or pronoun, and it functions as an adjective or adverb to describe a noun or verb.
Adverb
"To stem" is an infinitive. When an adverb is placed between "to" and "stem", it creates a split infinitive. A split infinitive is not a part of speech but a highly controversial grammar issue. Star Trek's "to boldly go. . ." is, perhaps, the most famous split infinitive.
An infinitive is to + simple form of a verb. It often acts as a noun, adjective, or adverb. Because of this, an infinitive is never the main verb in a sentence.The dog has been locked in the house all day. She wants to run in the yard.
adverb
as a noun, adjective, adverb
"to finish your test" is the infinitive phrase.
The infinitive functions as:a subject: To stare is rude.a direct object: We all want to seeyou.a subject complement: My goal is to attend college.an adjective: I think it's time to go.an adverb: We need two points to win.
adverb
It's not an adverb. 'to dance' is a verb (specifically, it is the infinitive part.)
Adverb
"To become famous" is an infinitive phrase. It could serve as a noun, adjective, or adverb, but there is no adverb in it.
adverb
form of the verb not inflected for grammatical categories such as tense and person and used without an overt subject. In English, the infinitive usually consists of the word to followed by the verb
It can be. To run is the infinitive form of the verb. It can be a noun, adjective or adverb. Examples: I was almost ready to run. - infinitive to run modifies adjective "ready" He left the senate to run for president. - infinitive to run modifies the verb "left"
An infinitive phrase. An infinitive phrase is a noun phrase with an infinitive as its head. Unlike the other noun phrases, however, an infinitive phrase can also function as an adjective or an adverb.
noun, adjective, and adverb