http://www.adelescorner.org/grammar/plurals/plurals1.html

http://www.adelescorner.org/grammar/plurals/plurals2.html

http://www.english-4u.de/plural_ex4.htm

Epäsäännölliset monikot:

http://www.adelescorner.org/grammar/plurals/plurals3.html

http://www.perunakellari.fi/chat/c4-kpl13-monikot.htm