Đổi sang câu chủ động. 
1. A  large collection of books is kept in our school library

→They keeps a large collection of books in our school library.
2.  Her room is painted green by this worker

→This worker paints her room green.
3. They aren’t liked much at school

→They don't like them much at school.
4.  Are those books bought by your sister?

→Does your sister buy those books ?
5.  Is this bladder mended by Mr. Green?

→Does Mr.Green mend this bladder ?
6. Potatoes aren’t planted in winter

→They don't plant potatoes in winter.
7. This kind of books is developed by a famous writer

→A famous writter develops this kind of books.
8. Is this house sold?

→Do they sell this house ?

S(O) + be + V3 + by + S.

→S + V + O.

$\color{red}{\text{Xin 5* và ctrlhn ^^}}$