http://www.englishpage.com/verbpage/simplepast.html
http://www.isabelperez.com/happy/tenses/exercises/past_cont_3.htm
http://www.myenglishteacher.net/irregular_verbs.html
http://web2.uvcs.uvic.ca/elc/StudyZone/330/grammar/irpast1.htm
http://www.eslgamesworld.com/members/games/grammar/New_Snakes_%20Ladders/Past_simple_tense.html
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