They want to buy tickets.
Do they want to buy tickets? - общий
What do they want to buy? - специальный
Who wants to buy tickets? - специальный вопрос к подлежащему
Do they want to buy tickets or books? - альтернативный
They want to buy tickets, don't they? - разделительный
They want to buy tickets.
Do they want to buy tickets? - общий
What do they want to buy? - специальный
Who wants to buy tickets? - специальный вопрос к подлежащему
Do they want to buy tickets or books? - альтернативный
They want to buy tickets, don't they? - разделительный