1)Общий: Did Genghis Khan start the Mongol Empire?
2)Специальный: What did Genghis Khan start?
3)Альтернативный: Did Genghis Khan start the Roman Empire or the Mongol Empire?
4)Разделительный: Genghis Khan started the Mongol Empire, didn't he?
5)Вопрос к подлежащему: Who started the Mongol Empire?