Completar frases Modal verbs of obligation, prohibition, advice and permissionVersión en línea This is to practice the rules for modal verbs por Fátima Canche 1 to must have We use and for obligatio n 2 mustn't can can't and ( must not ) are used to show that something is prohibited ( not allowed ) . is most often used to ask for or give permission . 3 don't to have We use to show that there is no obligation . You can do something if you want but it is not an obligation . 4 Had better should ought to English speakers use the modal verbs and , to express that they think something is a good ( or a bad ) idea . is a bit stronger . It includes the idea of a warning : something bad will happen if you do not follow my advice .
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