Ought is a modal auxiliary verb. The "to" is part of an infinitive (to + base form of a verb).
ought to go
ought to have
ought to see
It's a contraction for should have. In a sentence, it's used as an auxiliary verb.
Shouldn't is a contraction of should (modal verb) and not (adverb).
Can and should are modal auxiliary verb.
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
adverb
what part of speech is work
The part of speech for "unfamiliar" is an adjective.
The part of speech for "explicit" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "breezy" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "twirl" is a verb.