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We usually use must to talk about obligations which come from the speaker and we generally use have (got) to when we refer to obligations that come from outside the speaker. …
MUST definition: to be obliged or bound to by an imperative requirement. See examples of must used in a sentence.
Must is a modal verb. It is followed by the base form of a verb. You use must to indicate that you think it is very important or necessary for something to happen. You use must not or mustn't to indicate that you think it is very important or necessary for something not to happen.
There are 27 meanings listed in OED's entry for the verb must, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
Something that is absolutely required or indispensable. Promptness on the job is a must. Comfortable boots are a must when going on a hike.
Anything that is required is a must: drinking enough water is a must for being healthy. When you adopt a new dog, making sure he'll get along with your cat is a must.
Have to is a more informal while Must is mostly used in written orders or instructions. Also, Must expresses obligation imposed by the speaker while Have to expresses external obligation.
Must | Learn English Modal Verbs | English Grammar Lesson by Woodward ...
"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."
