No, infinitives are not inflected to agree with the subject. "Plays" is the present tense third person singular conjugation of "play". For more information on infinitives, see the related link below.
The verb takes the base form in commands Sit down. Look out!
The inflection in "slept" is past tense simple inflection of the verb "sleep."
"To be" is the infinitive form of are.
So is not an infinitive. An infinitive is [to + a verb].
The verb is to do.
An infinitive is the basic form of a verb, without an inflection binding it to a particular subject or tense (e.g., see in we came to see, let him see ).
The verb takes the base form in commands Sit down. Look out!
The inflection in "slept" is past tense simple inflection of the verb "sleep."
"To be" is the infinitive form of are.
So is not an infinitive. An infinitive is [to + a verb].
The verb is to do.
The infinitive form of the verb "salvation" is "to save."
The infinitive of this verb is "vouloir".
Infinite surd is a term used in mathematics. The definition of an infinite surd is a never ending irrational number with an exact value that would be left in square root form.
The word jogging is not simply an infinitive. An infinitive is [to + a verb]. To jog would be an infinitive.
Infinitive is the basic form of a verb. "Let" is the infinitive in this case.
[to] be