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

4.1 Modals rule|SO Intermediate

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