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English definition of “should”

should

modal verb
 
 
strong /ʃʊd/ weak /ʃəd/
BEST B1 used to say or ask what is the correct or best thing to do: He should have gone to the doctor. Should I apologize to her? You shouldn't be so angry with him.Duty, obligation and responsibility
EXPECT B1 used to say that you expect something to be true or that you expect something to happen: She should be feeling better by now. The letter should arrive by Friday.Planning, expecting and arrangingPlotting and trapping
POSSIBLE formal used to refer to a possible event in the future: Should you have any further queries, please do not hesitate to contact me. I'll be in my office, if anyone should ask.Possible and probable
why should/shouldn't...? B2 used to ask or give the reason for something, especially when you are surprised or angry about it: He told me to forgive her, but why should I? Motives and reasons
(Definition of should from the Cambridge Learners Dictionary © Cambridge University Press)
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