Are his grandparents in the country ? Общий
Where are his grandparents? Специальный
Who is in the country ? Вопрос к подлежащему
His grandparents are in the country ,aren't they? Разделительный
Are his grandparents or parents in the country ? Альтернативный
Aren't his grandparents in the country? Вопросительно-отрицательный
Must my classmates bring textbooks to school? Общий
What must my classmates bring to school? Специальный
Who must bring textbooks to school? Вопрос к подлежащему
My classmates must bring textbooks to school,mustn't they? Разделительный
Must my classmates bring textbooks or workbooks to school? Альтернативный
Mustn't my classmates bring textbooks to school? Вопросительно-отрицательный