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