You mustn't/don't have to put on your evening dress

You don't have to put on your dress in the evening

You don't have to put on your evening dress .Ты не обязана надевать свое вечернее платье. Обьяснение:must -обязанhave to -обязанНельзя сказать You mustn't have to put on your evening dress.Это получается Ты не обязана обязана надевать вечернее платье. Надо:Ты не обязана надевать вечернее платье.