obligation, which in different contexts may acquire additional shades of meaning, such as advisability and desirability,
E.g.You ought to say a word or two about yourself. Siz bu haqda biror so`z aytishingiz lozim.
Ought she to warn him?
He oughtn’t to mention it to anybody.
“It doesn’t mean you ought to marry a Yankee.” He persisted.(F. Scott Fitzgerald)
In this meaning ought to is possible in all kinds of sentences, though it is felt to be awkward in questions where should is preferred.
Generally ought torefers an action to the future and is followed by the simple infinitive. With reference to the present ought tois used with the continuous infinitive or with the simple infinitive if the verb is stative.
E.g. At your age you ought to be earning your living.
In combination with the perfect infinitive ought to in the affirmative form shows that a desirable action was no fulfilled.
E.g. You ought to have chosen a more suitable time to tell me this news.
In the negative form ought to in combination with the Perfect Infinitive shows that an undesirable action was fulfilled
E.g. I’m sorry. I ought to have said it.
You oughtn’t to have married her, David. It was a great mistake.
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