1)A little girl hasn't painted a funny picture.
Has a little girl painted a funny picture?
2) We have not visited this town.
Have we/they visited this town?
3) The kettle has not boiled.
Has the kettle boiled?
4) They have not understood the task.
Have they understood the task?
5) Ben hasn't broken his leg.
Has Ben broken his leg?
6) My mother hasn't got a postcard from her friend.
Has my mother got a postcard from her friend?
7) We have not had breakfast.
Have we had breakfast?