The workers have built a new block of flat in our region.
The workers haven't built a new block of flat in our region.
Have the workers built a new block of flat in our region? - общий
Have the workers built a new block of flat or houses in our region? - альтернативный
What have the workers built in our region? - специальный
The workers have built a new block of flat in our region, haven't they? - разделительный