Must

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Must is a modal auxiliary verb. It has no -s in the third person singular.

Must is followed by an infinitive without to.

Questions and negatives are made without do.

Must has no infinitive (to must) or participles (musting, musted). And it has no past tense. When necessary, we use other words, for example forms of have to.

Meaning

Must indicates that it is necessary or very important that something happens. If you say that you must do something, you mean that you have a definite intention to do something in future.

If you tell someone else that they must do something, you are emphasizing that it is a good idea for them to do that.

Sections in this article

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