TEENS 4:"PASSIVE VOICE"

PRESENT PASSIVE:
http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_present.htm
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present
http://www.ego4u.com/en/cram-up/grammar/passive/exercises
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present-2
http://www.perfect-english-grammar.com/passive-exercise-1.html

PAST PASSIVE:
http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_past.htm
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?02
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past-2
http://www.perfect-english-grammar.com/passive-exercise-2.html

PRESENT AND PAST PASSIVE:
http://www.englishexercises.org/makeagame/viewgame.asp?id=1870
http://www.englishexercises.org/makeagame/viewgame.asp?id=4356