Britannica Dictionary definition of SHOULD
[modal verb]
1
a
—
used to say or suggest that something is the proper, reasonable, or best thing to do
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You should [=ought to] get some rest.
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They should be punished.
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We should leave a few minutes early to make sure we get there on time.
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Maybe you should consider finding a new job.
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I should emphasize that these numbers are only estimates.
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My friends say that I should quit the team.
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What time should we meet? [=what is the best time for us to meet?; what time do you want to meet?]
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Patients should inform the receptionist upon their arrival.
b
—
used with have to say that something was the proper, reasonable, or best thing to do but was not done
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You should have been more careful.
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She shouldn't have spoken to him so rudely.
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What should I have done?
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Should I not have gone? [=was it wrong for me to go?]
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I should have known that he would be late. [=I didn't know that he would be late, but it would have been reasonable for me to expect it because he is often late]
c
—
used with have to say that you wish someone had seen, heard, or experienced something
2
—
used to ask for someone's opinion
3
—
used to say that something is expected or correct
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Everyone should [=ought to] have a copy of the handout.
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There should be four place settings at the table, not six.
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“He feels very sorry about what happened.” “Well, he should!”
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You should be ashamed of yourself, behaving so rudely to our guests!
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They should be here by now. = They should have arrived by now. [=I expected them to be here by now]
4
a
—
used when saying that you feel a specified way about someone's words or behavior
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I'm surprised that he should intentionally be so rude to you.
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It's strange (that) you should say that.
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Funny you should mention it. [=I think it's odd/strange that you mentioned it] I've been thinking the same thing.
b
—
used to emphasize what you believe, think, hope, etc.
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I should imagine it won't take more than two hours to drive there. [=I am fairly certain that it won't take more than two hours]
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I should think not. [=I really don't think so]
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I should hope that she would apologize. [=I expect her to apologize]
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“She apologized for her rude behavior.” “Well, I should hope so!”
5
—
used with have in negative statements as a polite way of thanking someone for doing something
6
somewhat formal
—
used to talk about the result or effect of something that may happen or be true
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Should [=if] you change your mind, please let us know.
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I will feel very guilty should anything go wrong. [=if anything goes wrong]
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usually used with if
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I will feel very guilty if anything should [=were to] go wrong.
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If he should call [=if he calls], tell him I'm not home.
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If you should see them [=if you see them], say hello for me.
7
British
—
used to say that you would do or feel something if something specified happened
—
only used after I or we
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If my husband treated me like that, I should [=would] divorce him.
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I should be surprised if many people go to the fair on such a rainy day.
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I should not be surprised if no one goes.
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I shouldn't [=wouldn't] be surprised at all.
8
British
—
used when giving someone advice
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only used after I or we
9
British
—
used to say that you want to do or want to have something
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only used after I or we
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“They really need some help.” “Well, I should be glad to help them.”
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I should like to call my lawyer.
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“Would you care for a drink?” “I should like one very much.”
how/why should I/we know
—
used to say that you do not know the answer to a question and are surprised that you were asked it
what/who should you see but
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used to say that you are surprised to see something or someone