Dieser Inhalt ist derzeit auf Englisch verfügbar.
Seite wird geladen…
Dieser Inhalt ist derzeit auf Englisch verfügbar.
Zugriff auf Kurs wird geprüft…
Must and have to both say that an action is necessary: You must switch off the lights. / We have to finish by six. Must is common in written rules and notices; have to is common when we talk about our duties. Both are followed by the base verb: no to after must and no -s on the verb. Must never changes, but have to does: I have to, she has to. Typical mistake: She must to call the client. → She must call the client.
Mustn't and don't have to look similar, but they mean very different things. You mustn't park here = it is prohibited, so do not do it. You don't have to park here = it is optional, so you can choose another place. With he, she or it, use doesn't have to: Maria doesn't have to wear a uniform. Typical mistake: using don't have to for a prohibition. For the rule about smoking, say You mustn't smoke in the office, not You don't have to smoke in the office.