Have the children seen a film?
Who has seen a film?
What have the children seen?
Have the children seen a film or a cartoon?
The children have seen a film, haven’t they?
Have the children seen a film? Общий
The children have seen a film,haven’t they? Разделительный
Who has seen a film? Вопрос к подлежащему
What have the children seen? Специальный
Have the children seen a film or a documentary? Альтернативный