Отрицательная форма:
Leonardo Da Vinci didn't design a canal system in Florence.
Вопросы:
Did Leonardo Da Vinci design a canal system in Florence? (общий)
What did Leonardo Da Vinci design? (специальный)
Who designed a canal system in Florence? (специальный к подлежащему)
Did Leonardo Da Vinci design a canal system in Florence or in Venice?
(альтернативный)
Leonardo Da Vinci designed a canal system in Florence, didn't he? (разделительный)
