you must not
Lei non deve abbandonare la speranza.
She must not give up hope.
Lei non deve andare a scuola di sabato.
She doesn’t have to go to school on Saturdays.
She doesn't have to call me.
You must not believe me.
Lei non deve darsi tutte queste arie.
She shouldn't be so full of herself.
She mustn't say anything.
Lei non deve entrare in contatto con lui.
She must not come into contact with him.
Lei non deve essere così formale.
You don't have to be so formal.
She must not be here now.