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"When we use preposition ‘to’ before any base form of verb, it is called Infinitive Verb. The phrase 'to be' is acting as the subject of the sentence."
In a sentence if Infinite Verb is to be used, it is a Normal Verb, which come first and then second is Infinitive Verb. Here are some Infinitive Verbs: to love, to eat, to run, to believe, to follow, to laugh, to stare, to wonder, to walk, to cook, to understand, to make, to have, to hold, to sleep, to dream etc.
An infinitive is a verbal that can function as noun, adjective, or adverb. It is formed by using "to" + the verb.