MUST: moral (internal) obligation, I must do more sport., written rules, All students must take the exams before they get a certificate., HAVE TO: external obligation, We have to wear a uniform at work., due to circumstances, I have to wake up early tomorrow because I’ m having an important meeting at 9 a.m., MUSTN’T: strict prohibition, 
it’s not allowed, You mustn’t park your car here. , You mustn’t smoke inside the building., DON’T HAVE TO: absence of necessity (it’s not necessary but if you want you can do it), You don’t have to use paper dictionary., SHOULD: weak obligation (advice), You should eat more vegetables., OUGHT TO: weak obligation (advice) (2), You ought to do more grammar exercises., SHOULDN’T: (it’s not a good idea to do it), You shouldn't use Google to translate texts. ,

Modals Obligation Intermediate

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