All students have to work hard - It's important but not an obligation, Studets must always be polite to their teachers - It's a rule / obligation (mandatory), Students don't have to study Languages and Maths - Isn't necessary to do something, Students mustn't be late for class - It's obligatory NOT to do something. It goes againts the rules,

Have to / Must

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Automatikus mentés visszaállítása :?