Задать общий вопрос(простой и с отрицанием)
Альтернативный
Специальный к подлежащему(простой и с отрицанием)
Разделительные вопросы
The crew members are thinking about their Christmas holidays.

Общие:Are the crew members thinking about their Christmas holidays?Aren't the crew members thinking about their Christmas holidays?Альтернативный:Are the crew members thinking or planning their Christmas holidays?К подлежащему:Who is thinking about the Christmas holidays?Who isn't thinking about the Christmas holidays?Разделительные:The crew members are thinking about their Christmas holidays, aren't they?The crew members aren't thinking about their Christmas holidays, are they?