Should

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Should is a modal auxiliary verb. There is no –s in the third person singular.

Should is followed by an infinitive without to. Questions and negatives are made without do.

Note that should is the past equivalent of shall in indirect speech.

Uses

To express obligation

Should is often used to talk about duty or obligation. It can also be used to say or ask what the correct or best thing to do is.

Note that should is not as strong as must.

In questions, should is used to ask for advice or instructions.

To express probability

Should can express logical probability.

See also

Modal Auxiliary Verbs
Can
May and Can: differences
Could
May
Might
Will
Would
Shall
Should
Should: other uses
Must
Must: uses
Must and have to: The Difference
Ought to
Need
Had better
Should, Ought and Must: The difference
Primary auxiliaries
Verbs