http://www.saberingles.com.ar/exercises/107.html
http://www.manythings.org/listen/franklin.html
http://www.englishpage.com/verbpage/verbs3.htm
http://www.englishpage.com/verbpage/verbs4.htm
http://www.english-room.com/pasttense_6a.htm
http://odl.vwv.at/english/odlres/res8/Grammar/grammar_exercises/tenses/past/past3.htm
http://valenciaenglish.netfirms.com/pastex.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irpast1.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irpast2.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irpast2.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/reading/visitor1.htm
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