Какое неправильное предложение: 1. there was some mice in the house cellar. 2. in front of the house there were several duks on the lawn. 3. there was no ghost in the attiic near the stairs.

Предложение There was some mice in the house cellar составлено неправильно. Конструкция there was употреблена в единственном числе, тогда как существительное mice стоит во множественном числе (это слово - исключение из правила образования мн. ч.). Правильно было бы так: There were some mice in the house cellar. / There was a mouse in the house cellar.