Ответ:
Был бы рад если сделаешь лучшим ответом
Объяснение:
1) The project has been already finished by them.
2) The best suggestion has been made by Tom.
3) This technique has been tried by us many times.
4) Some posters have been made by students for the school feast.
5) The books have been already taken back to the library by me.
6) Those letters just have been posted by her.
7) The test has been already checked by my teacher.
8) The key has been lost by him.
9) All the windows have been opened by us.
10) This exercise has been done by me.
11) The task just has been written by her.
12) The bread has been bought by me on the way home.