Поставить разделительный вопрос в приложения: 1) the postmen bring the mail twiсe а day. 2) my brothers work at a big electronics company. 3) the children walk to school every morning. 4) generally they go to the university by bus.

1) The postmen bring the mail twiсe а day, don't they?
2) My brothers work at a big electronics company, don't they?
3) The children walk to school every morning, don't they?
4) Generally they go to the University by bus, don't they?