B1 used to show when it is necessary or would be a good thing to perform the activity referred to by the following verb(表示做某事有必要、值得或有利)应该,应当
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If there's any doubt about the rocket's engines, we ought to cancel the launch.
I'm surprised at you behaving so badly - you ought to know better.
That child ought to be in bed.
Whoever uprooted that tree ought to be ashamed of themselves.
Men and women ought to be able to compete for jobs on an equal footing.
B2 used to express something that you expect will happen(表示期望某事发生)该,应该
More examples
In theory, the journey ought to take three hours, but in practice it usually takes four because of roadworks.
This sauce needs a bit of flavour - I know, some lemon juice ought to do the trick.
Your rash ought to clear up quickly if you use this ointment regularly.
He took his umbrella so he ought not to get wet.
Mum ought to be home from work by now, so I'll give her a ring.
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