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'Ought to' is used to express an obligation or an expectation that someone should do something. It is also used to express the likelihood of something happening.
'Ought to' expresses ideas such as duty, advise, necessity and moral obligation. It is not as forceful as must, but it is stronger than should.
"Auxiliary-cum-verbs" are :
These 11 auxiliaries are also used as verbs, therefore, they are called Auxiliary–cum–verbs.
These are used to form Tenses. ( Please refer Tense Table).
"Pure Auxiliary verbs" are :
These 20 auxiliaries only support normal verbs, therefore, they are called Pure Auxiliary Verbs. They are also called Models or Model Auxiliary Verbs.