http://www.englishexercises.org/makeagame/viewgame.asp?id=2288
http://www.englishexercises.org/makeagame/viewgame.asp?id=2446
http://www.grammar.cl/Games/Plural_Nouns.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/plural1.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/plural2.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irrplu1.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irrplu2.htm
http://www.bbc.co.uk/apps/ifl/worldservice/quiznet/quizengine?ContentType=text/html;quiz=1738_plurals
NEWhttp://www.grammar-quizzes.com/agree1b.html
-OS -OES
http://www.tcet.com/EAOnline/GrammarCentral/irregularplural.html
-FS, -VES
http://www.tcet.com/EAOnline/GrammarCentral/moreplural.html
IRREGULAR
http://www.tcet.com/EAOnline/GrammarCentral/reallyirregular.html
FOREIGN
http://www.tcet.com/EAOnline/GrammarCentral/borrowedirregular.html
NO SINGULAR
http://www.tcet.com/EAOnline/GrammarCentral/nosingular.html