Original: Terrorists have attacked many cities in the world for months.
Passive: Many cities in the world have been attacked by terrorists for months.
Original: The IBM company may offer my sister a job soon.
Passive: My sister may be offered a job by the IBM company soon. (Or: A job may be offered to my sister by the IBM company soon.)
Original: Everyone should keep food in the refrigerator to keep it fresh.
Passive: Food should be kept in the refrigerator to keep it fresh.
Original: Lien couldn't open the door of the classroom.
Passive: The door of the classroom couldn't be opened by Lien.
Original: They should announce that news as soon as possible.
Passive: That news should be announced as soon as possible.
Original: Phong has returned the scientific book to the library.
Passive: The scientific book has been returned to the library by Phong.
 

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