The infinitive is the base form of a verb often followed by "to", which is not a preposition in this case but rather the sign of the infinitive. An infinitive can be used as a noun, adjective, or adverb. Examples include "to dance" functioning as a noun, "to drink" as an adjective, and "to help" as an adverb. Infinitive verbs can be used in several possible ways.

1. Infinitive
Definition:
The infinitive is the base of a verb, often followed by to. The word “to” is not a
preposition in this case. It is often called the "sign of the infinitive". An infinitive can be used as
a noun, an adjective or an adverb.
“To” should be came before the main verb.
Examples:
1. To dance was his ambition. (as a noun)
2. They need water to drink. (as an adjective)
3. The officer returned to help. (as an adverb)
Using an Infinitive Verb
There are several possible ways to use infinitive verbs.