Transform the following:
 Ex. Millions of people read the magazine.
 The magazine is read by millions of people.
 1. Mary cleans the rooms every day.
 Answer:___________________________________________.
 2. Someone writes an article every day.
 Answer: __________________________________________.
 3. Someone has already cleaned the window.
 Answer: __________________________________________.
 4. Somebody was cleaning the room when I arrived.
 Answer: