What purpose of some modals like should not and ought not?

Modals (also called modal verbs, modal auxiliary verbs, modal auxiliaries) are specific verbs that behave irregularly in English. They are different from conventional verbs like "work, play, visit..." They convey additional information about the function of the primary verb that follows it. They can perform a wide range of communication functions. Modals are a type of helpful verb that does not obey subject/verb agreement and does not show tense. In the third person singular, they do not add an's' (he, she, it). They aren't conjugated in any way. They're employed to demonstrate likelihood, potential, and necessity. Modals, like other assisting verbs, are always followed by another verb. If a modal is present, however, the second verb must conjugate differently.

What is modal verb and modal noun?

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