-> …………those shelves are carried to our library……………………………………………………………………………

-> ………………john is seen at the bus stop every morning………………………………………………………………………

-> …………………those newspapers are put on the reading table……………………………………………………………………

-> ………………this book is sold………………………………………………………………………

-> ………………an important research is done in this library………

11.    They carry those shelves to our library        those shelves are caried to our libraly
12.    People see John at the bus stop every morning john is seen at the  bus stop every morning      
13.    They put those newspapers on the reading table     those newspapers are put    on the reading table
14.    He sells this book  this book is sold by him      
15.    They do an important research in this library an important research is done in this library