1) Отрицательное предложение: Last spring the flood did not (didn’t) destroy half of the town. 2) Альтернативный вопрос: Did the flood destroy half of the town last spring or last summer? 3) Специальный вопрос: When did the flood destroy half of the town? 4) Вопрос к подлежащему: What destroyed half of the town last spring? 5) Отрицательный вопрос: Didn’t the flood destroy half of the town last spring? 6) Разделительный вопрос: Last spring the flood destroyed half of the town, didn’t it?