Further explanation on Passive voice

Before Tuesday's class I  need you to watch the following videos where you have an easy explanation.

http://www.youtube.com/watch?v=WNk4q3K2CFM

written explanation of Passive voice and exercises:

http://www.englishgrammarsecrets.com/passive/menu.php

http://www.englishexercises.org/makeagame/viewgame.asp?id=3339

http://menuaingles.blogspot.com/2011/02/unit-22-level-3-upper-intermediate.html

see you in class,

Your teacher.