Relier Pairs Modal Verbs for Obligation Version en ligne Have to' and 'must' are both used to express obligation. There is a slight difference in the way that they are both used. 'Have to' shows that the obligation comes from someone else, not the speaker. This is usually referring to a rule or law. Let´s check together! par Claudia Biviana Ruiz 1 Have is used to express... 2 Don´t/ doesn´t have to describe... 3 What are the two types of modal verbs of obligation? 4 Must is used to express... 5 Must, Musn´t and have to describe... actions which are voluntary about obligations. external obligations. Internal obligations. those that primarily express a firm obligation or necessity – must and have to - and those that express a recommendation or moral obligation – should and ought to. obligations
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