PRACTISE THE PASSIVE FORMS!

http://esl.about.com/library/quiz/blgrquiz_passive1.htm

http://esl.about.com/library/quiz/blgrquiz_passive2.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=224

http://www.englishexercises.org/makeagame/viewgame.asp?id=202

http://www.englishexercises.org/makeagame/viewgame.asp?id=1213

http://www.englishexercises.org/makeagame/viewgame.asp?id=1870