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ought to
01
должен быть
used to talk about what one expects or likes to happen
02
надо бы
used to talk about what one considers to be the right thing to do
Пример
Peter ought to be ashamed of himself.
If you're passing blood you ought to see a doctor.
A few hours on his own ought to cool him off.
I think we ought to keep the truth from him until he's better to avoid causing more stress.
The new system isn't working yet, but a few more adjustments ought to do the job.