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English definition of “should”

should

modal verb  /ʃʊd, ʃəd/ us  

should modal verb (DUTY)

used to express that it is necessary, desirable, or important to perform the action of the following verb: He should have told me about the change in plans. People like that should go to jail. Where should we meet tonight?

should modal verb (PROBABLE)

used to express that the action of the main verb is probable: She should be back at any minute. If you follow these directions, you shouldn’t have any trouble finding our house. That should be enough food for five people.

should modal verb (OPINION)

fml used to express a desire or opinion: I should think he’d be happy just to have a job. I shouldn’t worry about that if I were you.

should modal verb (ASKING WHY)

used after a question word, such as "how" or "why," when asking a reason for something: How should I know where you put the car keys?
(Definition of should from the Cambridge Academic Content Dictionary © Cambridge University Press)
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