1. Передайте следующие предложения в пассивном залоге.
1) He sent for the doctor an hour ago.
2) They will write a letter tomorrow.
3) They built a new hospital last year.
4) She is reading a book at the moment.

:-)

The letter will be written tomorrow.A new hospital was built last year.A book is being read at the moment.Первое не уверена...Может быть, так:The doctor was sent for an hour ago.