when is the expression of ought to used? 这个在 英语 (美国) 里怎么说？

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I don't want to do my homework, but I ought to if I want to get a good grade.

You ought to have called her back.

You ought to apologize after that.

Most people say 'should have' instead, but ought is more like, you should do it because it is your duty or responsibility. A lot of people still use the word.