ought to - Meaning, pronunciation, collocation and usage 英漢雙解 | Mr. Ng 線上詞典

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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

[ + infinitive ] You ought to be kinder to him.你应该对他好一点。

We ought not/oughtn't to have agreed without knowing what it would cost.不知道它的费用，我们本不应该同意的。

"We ought to be getting ready now." "Yes, I guess we ought (to)."“我们现在应该做好准备了。”“对，我想是的。”

More examples

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

He ought to be home by seven o'clock.7点前他应该到家了。

They ought to have arrived at lunchtime but the flight was delayed.他们本该在午饭时到达，可是航班延误了。

If you show the receipt, there ought not to be any difficulty getting your money back.如果你出示收据，退钱给你应该不成问题。

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.