http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-28628.php
http://www.kico4u.de/english/uebungen/passiv/simplepresein.htm
http://www.ego4u.de/de/cram-up/grammar/passive/exercises?simple-present
http://www.ego4u.de/de/cram-up/grammar/passive/exercises?simp
http://www.english-grammar-lessons.com/passive/exercise2.swf
http://www.english-grammar-lessons.com/passive/exercise3.s
http://www.englishgrammarsecrets.com/passive/exercise5.swf
http://www.english-grammar-lessons.com/passive/exercise4.swf
http://www.better-english.com/grammar/thepassive2.htm
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