Общий вопрос
Have they been to the country this summer?
Специальный вопрос
Where have they been this summer?
Вопрос к подлежащему
Who has been to the country this summer?
Разделительный вопрос
They have been to the country this summer, haven't they?
Альтернативный вопрос
Have they been to the country this summer or this month?