Should and Ought to
These two modals are similar in meaning. They are often used to express advice, a suggestion or moral obligation. For example, to express advice you can say:
You should/ought to give up smoking.
To express a moral obligation which may be evaded:
Incorrect: I should visit my aunt.
Correct : I ought to visit my aunt.
Note: The correct sentence here implies that I shall not visit her.
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