English grammar (See all our English grammar tips)
Ought toOught to has a similar meaning to should. They both express the conditional:
You ought to pay him back shortly. You should pay him back shortly.
She oughtn't speak so loudly. It would be better if she didn't speak so loudly.
You ought not (to) speak with your mouth full. You should not speak with your mouth full.
Used less frequently than should, ought is always followed by a verb in the infinitive with to, except in the negative form, where we don't need to add to:
You ought not (to) ask so many questions. It would be better if you didn't ask so many questions.
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