They often have lunch in this café,don't they? Разделительный
Do they often have lunch in this café? Общий
Who has lunch in this cafe? Вопрос к подлежащему
Do they often have lunch or dinner in this cafe? Альтернативный
How often do they have lunch in this cafe? Cпециальный
What do they often have in this cafe?Специальный
Where do they often have lunch? Специальный