(used to express that logically there is a need for the action or state of the next verb to be true): There must be some mistake (= there cannot be any other explanation possible). She must have had a very good reason for what she did.

We use have to / must / should + infinitive to talk about obligation, things that are necessary to do, or to give advice about things that are a good idea to do.

Learn English > Grammar > Verbs > Modals > have to, must have to, must Have to is NOT an auxiliary verb (it uses the verb have as a main verb). We include have to here for convenience. Must is a modal auxiliary verb. In this lesson we look at have to, must and must not, followed by a quiz to check your understanding. have to for objective obligation We often use have to to say that something ...

"Must" is a modal verb most commonly used to express certainty. It can also be used to express necessity or strong recommendation, although native speakers prefer the more flexible form "have to."

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The meaning of MUST is be commanded or requested to. How to use must in a sentence.