Ответ:
3 They are taken by their nanny to the park every day.
4 It can't be changed.
5 The policeman was asked by Meg for directions.
6 It can't be changed.
7 It can't be changed.
8 These photographs were taken by Sam.
Объяснение:
Переделать в пассивный залог можно только такие предложения, в которых сказуемое представляет собой переходный глагол, то есть глагол с прямым дополнением (to read books, to take someone somewhere, to see something or someone и т. п.)
