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