"-ir Verbs"

http://www.niles-hs.k12.il.us/DAVMAL/images/ir.gif

http://keaton-world.com/spanish.html
http://www.quia.com/quiz/117789.html
http://www.studyspanish.com/cgi-bin/verbs/verb_drill.cgi?option=1&title=17&type=A&conjugations=16&subjects=1