Răspuns:
criterion - criteria
ox- oxen
louse - lice
Mai multe exemple de substantive iregulate :
foot - feet
tooth - teeth
goose - geese
man - men
woman - women
knife - knives
life - lives
wife - wives
calf - calves
leaf - leaves
potato - potatoes
tomato - tomatoes
hero - heroes
torpedo - torpedoes
veto - vetoes
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