Вопросительная форма( общий вопрос)
Had David booked the room in the hotel before?
Who had booked the room in the hotel before? Вопрос к подлежащему
Where had David booked the room before? Специальный
When had David booked the room in the hotel ? Специальный
David had booked the room in the hotel before,hadn't he? Разделительный