http://www.englishexercises.org/makeagame/viewgame.asp?id=1870
https://elt.oup.com/student/solutions/preint/grammar/grammar_10_012e?cc=global&selLanguage=en
http://www.agendaweb.org/verbs/passive-present-past-exercises.html
https://www.ego4u.com/en/cram-up/grammar/passive
dimarts, 21 de febrer del 2017
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