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• "Must" si usa per esprimere un obbligo o un'indicazione forte.
• "Mustn't" si usa per esprimere un divieto assoluto.

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• POSITIVE
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  • I must have a cup of tea
  • You must eat a slice of cake
  • He must have a packet of cereal
  • She must have a box of chocolates
  • The store must have a can of cola
  • We must buy a jar of jam
  • You must purchase a tin of tuna
  • They must have a bottle of water

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• NEGATIVE
  • I mustn’t take a carton of milk because I'm allergic
  • You mustn’t use your mobile phone and drive
  • He mustn’t murder to the chickens in that way.
  • She mustn’t be lazy
  • The cow mustn’t be rude
  • We mustn’t be serious
  • You mustn’t be polite
  • They mustn’t be loud

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• QUESTIONS
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  • quiet = silenzioso = kwˈa͡ɪ͡ət
  • quite = abbastanza = kwˈa͡ɪt
  • Must we be quiet now? —Yes, you must / —No, you mustn’t

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• MUSTN’T AND DON’T HAVE TO
  • La forma negativa “mustn’t” esprime un divieto.
    • You mustn’t bring your dog into the restaurant.
  • Mentre “don’t / doesn’t have to” specificano che un’azione non è necessaria.
    • We don’t have to walk. We can take the bus.