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.


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.

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Sections in this article

Introduction To If Clauses
The Zero Conditional
The Type One Conditional
Type One Conditional- Alternate Forms
The Type Two Conditional
Type Two Conditional- Alternate Forms
The Type Three Conditional
Type Three Conditional-Alternate Forms
Mixed Conditional

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