ought /ˈɑːt/ verb
Learner's definition of OUGHT
[modal verb]
1
◊ Ought is almost always followed by to and the infinitive form of a verb. The phrase ought to has the same meaning as should and is used in the same ways, but it is less common and somewhat more formal. The negative forms ought not and oughtn't are often used without a following to.*ought后面几乎总是接带to的动词不定式。短语ought to与should的意思和用法相同，但ought to较不常用且更为正式。否定形式的ought not或oughtn't后面常不接to。
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used to indicate what is expected应该（表期望） -
They ought to be here by now.他们现在应该在这里了。
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You ought to be able to read this book.你应该可以读懂这本书。
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There ought to be a gas station on the way.路上应该有家加油站。
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He ought to have known better.他本该学得更聪明些。
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If my math is correct, the result ought to be zero.如果我算得对的话，结果应该是零。
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He ought to have enough money for the trip.他应该有足够的钱去旅行。
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She ought to be ashamed of herself.她应该为自己感到害臊。
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It ought not (to) make any difference. [=(more commonly) it shouldn't make any difference]这应该不起任何作用。
2
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used to say or suggest what should be done应该（表义务、责任、必要等） -
You ought to get some rest.你该休息休息。
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That leak ought to be fixed.那个裂缝应该修补。
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You ought to do your homework.你应该做家庭作业。
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We ought to go now.现在我们该走了。
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We ought to get together some time soon.我们应该尽快找个时间聚一下。
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You ought to apologize.你应该道歉。
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Children ought not [=should not] run near the pool.孩子们不该在池塘边乱跑。