Plural Girls: http://www.funbrain.com/plurals/index.html
Quiz 1: http://www.softschools.com/language_arts/la_games.jsp
Quiz 2: http://www.primaryresources.co.uk/online/Plurals2.htm
Quia Matching: http://www.quia.com/cc/333551.html
Quia Word Search: http://www.quia.com/ws/333551.html
Matching: http://www.manythings.org/wbg/irr_plurals1-mw.html
Puzzle 1: http://www.manythings.org/wbg/irr_plurals1-mw.html
Puzzle 2: http://www.manythings.org/wbg/irr-plurals2-jw.html
Tic Tac Toe: http://www.harcourtschool.com/activity/plural/index_pre.html