Bonjour
D- We can't watch TV
S- And we must take her dog for a walk. Poor dog! I mean he wears a stupid red coat and he can't run in the park with the other dogs.
H- Then we must eat her horrible pink cakes, but we can't have a drink of soda !
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Can > possibilité
Cannot ou can't > impossibilité
Must > obligation
Mustn't > interdiction
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Je ne connais pas ton cours mais tu peux utiliser "have to" à la place de "must"
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Bonne journée