Si forma aggiungendo -s al singolare: a game – the Olympic games
hero-heroes
pass- passes
dish- dishes
watch – watches
box – boxes
authority – authorities
boy- boys
wife – wives
knife – knives
half – halves
leaf – leaves
thief – thieves
self – selves
man – men
foot – feet
goose – geese
woman – women
tooth – teeth
mouse – mice