At the end of the 8th century new invaders came to the coasts of Britain.
1) At the end of the 8th century new invaders came to the coasts of Britain, didn't they? - разделительный вопрос
2) Did at the end of the 8th century new invaders come to the coasts of Britain? - общий вопрос
3) Did at the end of the 8th century new invaders come to the coasts of Britain or America? - альтернативный вопрос
4) When did new invaders come to the coasts of Britain? - специальный вопрос
5) Who came to the coasts of Britain at the end of the 8th century? - специальный вопрос к подлежащему