The infinitive form of "should" is "to should."
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."
The infinitive form of had and has is to have.
"To be" is the infinitive form of are.
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].
Tienes que (+ infinitive, e.g dormir) = you have to....(e.g. sleep) Debes (+ infinitive) = you should/ought to....
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."
you are derives from the infinitive of to be. The infinitive that belongs to 'you are' is 'to be'.
"To be" is the infinitive form of are.
The infinitive form of had and has is to have.
to
The word jogging is not simply an infinitive. An infinitive is [to + a verb]. To jog would be an infinitive.
"to watch" Hence a slit infinitive is when someone inserts an adverb between the "to" and its verb. The Star Trek saying " To boldly go when no one ......." is a split infinitive; the infinitive should be "to go" not "to boldly" - Correctly phrased the Star Trek saying should read: "Boldly to go where no one...." This is very good info, but if you are on A+ the complete infinitive phrase would be "to watch two movies in a row".
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].
The infinitive form of "is am are" is "to be."