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⏩ Have to or have gat to are more common in speech to talk about obligation than must, particularly when we talk about obligations which are externally imposed.
🔘You have (got) to be 18 to vote.
⏩ Must is more often seen in written English, however.
🔘 Applicants must be over 18 years of age. (= from an application form)
The negative of must for this kind of obligation is must not and the past is had to.
🔘 Applicants must not be over 35 years of age.
😊When I was young, you had to be 21 before you could go in nightclubs.
⏩ Must is often used for advice or recommendation because it expresses the speaker's sense that this is necessary or important. Have to is less common in this context.
😊It's an absolutely brilliant film. You must go to see it.
⏩ Must also expresses logical deduction.
😊That must be Isabel's sister, she looks so like her!
The negative of must here is can’t and the past is must have.
😊 That can’t be your mother, she looks far too young.
😊 Laura must have gone home. she’s not here.

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