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