Can - It is allowed / permitted to do sth, Cannot - It isn’t allowed / permitted to do sth, Must - Use as an order or a strong recommendation or your personal decition, Mustn´t - It isn’t allowed / permitted; It´s forbidden to do sth, Have to/has to - It is necessary to do sth (when somebody / something else decides it e.g. a rule / regulation / instruction.), Don´t/doesn´t have to - It is not necessary to do sth, Should - It’s a good idea to do sth, Shouldn´t - It’s a bad idea to do sth, All modals - We use bare infinitive after them - V1 without "to",

Modals: must, have to, should, can

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