I must go out.
i must eat.
i must leave this.
must= o necesitate.
mustn't=must not = nu trebuie
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I must see the doctor.
policeman must be careful
i must listen to my parents.
i must be home early
you must clean your room

i mustn't be rude to my grandparents
you mustn't smoke here
she mustn't come today
i mustn't eat so much sugar
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