nothing
The infinitive is formed from the present stem, often but not always with the infinitive marker to. In the sentences We like to run and We cannot run, the verb run is in the infinitive.
An infinitive = to + a verbExample sentences:He likes to jog every morning.Dad asked her to cook the hamburger.She has always wanted to play the Flute.
In an infinitive phrase, it is always a preposition, and something you can do. For example: I like to think about my family. In this sentence to think is an infinitive phrase, and about my family is a prepositional phrase. to think, to be, to run, to do, to rescue, are all some of the MANY infinitives. Think this when you are trying to figure out if it is an infinitive phrase: to and something you can do! If it is something you can do after the preposition, then it is an INFINITIVE!
The infinitive form of "am" is "to be," the infinitive form of "is" is "to be," and the infinitive form of "was" is "to be."
An infinitive = to + a verbExample sentences:He likes to jog every morning.Dad asked her to cook the hamburger.She has always wanted to play the flute.
you are derives from the infinitive of to be. The infinitive that belongs to 'you are' is 'to be'.
The infinitive form of had and has is to have.
"To be" is the infinitive form of are.
The word jogging is not simply an infinitive. An infinitive is [to + a verb]. To jog would be an infinitive.
The infinitive "to read" is a bare infinitive.
The infinitive form of "was" and "were" is "to be." The infinitive form of "are" is also "to be."
So is not an infinitive. An infinitive is [to + a verb].