MUST: to talk about obligations, things are necessary or important;, a personal obligation, used in written rules, HAVE TO: to talk about obligations., things are necessary or important, an external obligation, SHOULD: it's a good idea;, advice;, MUSTN'T: it is not allowed, it is not permitted, DON'T HAVE TO: it is not necessary, but you can do it if you want, SHOULDN'T: advice, it's not a good idea, OUGHT TO: it's a good idea,

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