An infinitive is a simple verb combined with ‘to.’ For example: to sleep, to run, to fly, to hide
Remember this formula: Infinitive = to + verb
Infinitives can function as subjects, objects, adjectives, and adverbs. For example:
To wait for an answer seemed like a waste of time. (To wait is the subject of the sentence.)
I can’t stand it; I refuse to look. (To look is the direct object of the sentence.)