Shall

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Shall is a modal auxiliary verb. It is followed by an infinitive without to. Shall has no -s in the third person singular.

Questions and negatives are made without do.

With the first person

In the first person shall expresses simple futurity. It is used to show the strong possibility or near certainty of an action or event which is to take place in the future.

With the second or third person

In the second and third persons shall may express a command.

Sometimes it is used to make a promise.

Shall may also express a threat.

Note that shall is becoming increasingly less common in Modern English. Instead of using shall in the second and third person to indicate a command, promise or threat, people often use other verbs and expressions.

For You shall go at once, people often say You will have to go at once, You are to go at once or You must go at once.

Shall: Uses

To make suggestions

Shall can be used with the first person pronouns (I or we) to make suggestions.

To talk about certainty

Shall can show certainty. It is used to say that something will certainly happen, or that you are determined that something will happen.

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