Relier Pairs Must have toVersion en ligne The correct use of must , have to and their negative form par Sabs Negrete 1 You have no choice. 2 It is an obligation from the situation. 3 Not necessary and you can choose 4 It isn't necessary, just and advice 5 Forbidden or not allowed to do 6 Formal or written obligations 7 A personal very important, necessary thing to do DON'T HAVE TO MUST NOT HAVE TO MUST MUST SHOULD & SHOULDN'T HAVE TO