A Modal Auxiliary Verb used to refer to possible, rather than actual, events. It expresses a view about how desirable an action might be and is normally followed by the Infinitive of the main verb:
You ought to go and see a doctor.
It can also stand alone:
No, I ought not.
Negative:
The negative form of verb phrases containing ought is formed simply by adding not: you ought not to go and see the doctor. It is not standard English to use didn’t ought to.
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