When talking about school rules is it better to use MUST or HAVE TO? -- The prescribed difference is that 'must' refers to an inner command while 'have to' refers to an external authority. However, 'had to' is the past form of both 'have to' and 'must', and many native speakers pay little attention to the prescribed difference.
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JohnKeatsschool rulesIn American English regulations are much more likely to be phrased with 'must'.
CalifJimIn American English regulations are much more likely to be phrased with 'must'. Employees must wash their hands after using the restroom. Right lane must exit. CJ
I agree and, and the reason is that "must" is more formal and sounds stricter.
Some people say that "must" is for others, while "have to" is used for oneself. But I don't think that is valid