ATTENTION 4º ESO: THE PASSIVE VOICE

REMEMBER WE USE THE PASSIVE VOICE WHEN WE WANT TO FOCUS ON THE ACTION ITSELF, NOT ON WHO DID THE ACTION. WE USE THE PASSIVE WHEN WE DON'T NEED TO SAY OR WHEN WE DON'T KNOW WHO DID THE ACTION
Now let's practice a little bit, come on, it's very easy!!!
http://www.ego4u.com/en/cram-up/grammar/passive/exercises
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?02
http://www.eflnet.com/grammar/passive2.php