http://www.ego4u.com/en/cram-up/grammar/passive
Games:
http://eslgamesworld.com/members/games/grammar/football/passive%20voice/passive%20voice.html
http://www.eslgamesworld.com/members/games/grammar/basketball/active%20vs.%20passive%20voice/active%20vs.%20passive%20voice.html
Practice:
http://elt.oup.com/student/englishfile/preint3/grammar/file10/grammar10_a01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file07/grammar07_d01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/intermediate/a_grammar/file06/nef_int_grammar06_b01?cc=global&selLanguage=en
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