Modal Auxiliary Verb Should

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.

Sections in this article

Will as a modal auxiliary verb
Would as a modal auxiliary verb
Could as a modal auxiliary verb

 

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