http://www.ego4u.com/en/cram-up/grammar/passive/exercises
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?02
http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_present.htm
http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_past.htm
http://www.englisch-hilfen.de/en/exercises/active_passive/form_sentences_simple_past.htm
sábado, 27 de septiembre de 2014
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