Have to / must, to talk about obligation, or snth that is necesary to do, strong recommendations, Mustn't, smth is prohobited, you can use "can't" / "not allowed" instead of it, Should / shouldn't, to give advice or an opinion, you can use "ought to/ not ought to" instead of it, Must, specific or personal obligations, only exists in in the present, but it can be used with a future meaning, Have to, general, external obligations (rules/laws), exists in all tenses and forms, Don't have to, there is no obligation to do smth

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