foot→feet,
goose→geese,
tooth→teeth,
child→children,
man→men,
woman→women,
sheep→sheep,
deer→deer,
mouse→mice.
某些外来词变复数：datum→data,medium→media,bacterium→bacteria,curriculum→curricula,criterion→criteria,phenomenon→phenomena.(um/on→a)analysis→analyses,basis→bases,crisis→crises,diagnosis→diagnoses.(is→es )