1- http://elt.oup.com/student/project3rdedition/level2/unit3/grammar/exercise3?cc=global&selLanguage=en
2-http://www.ceipjuanherreraalcausa.es/Recursosdidacticos/SEXTO/datos/07_Footsteps/datos/unit3/UNIT_03.htm
3- http://www.juntadeandalucia.es/averroes/centros-tic/41009470/helvia/aula/archivos/repositorio/0/56/html/datos/07_Dreambox_6/swf/intro.swf
4- http://conteni2.educarex.es/mats/001036/contenido/
5- http://www.eslgamesplus.com/irregular-past-tense-esl-grammar-jeopardy-quiz-game/
6- http://www.eslgamesworld.com/members/games/grammar/perfectpast/irregular%20past%20spelling.html-
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