http://www.better-english.com/grammar/adjing.htm
http://www.grammar-quizzes.com/passive3a.html
/ww2.college-em.qc.ca/prof/epritchard/boreding.htm
www.clafoti.com/imagenes12/adj_ing_ed_2.htm
www.oup.com/elt/global/products/headway/preintermediate/a_grammar/unit10/hwy_preint_unit10_3/
perso.wanadoo.es/autoenglish/gr.ad.inged.i.htm
www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-1752.php
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