1 used to say what is the right thing to doThey ought to apologize.
‘Ought I to write to say thank you?’
‘Yes, I think you ought (to).’
They ought to have apologized (= but they didn't).Such things ought not to be allowed.
He oughtn't to have been driving so fast.
2 used to say what you expect or would like to happen
Children ought to be able to read by the age of 7.
Nurses ought to earn more.
3 used to say what you advise or recommend
We ought to be leaving now.
This is delicious. You ought to try some.
You ought to have come to the meeting. It was interesting.
4 used to say what has probably happened or is probably true
If he started out at nine, he ought to be here by now.
That ought to be enough food for the four of us.
Oughtn't the water to have boiled by now?
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