This document discusses regular and irregular plural forms in English. For regular plurals, the rules covered are adding -s to most words, -ies to words ending in consonant + -y, and -es to words ending in -o, -s, -ss, -x, -sh, or -ch. Irregular plural forms given as exceptions include roof/roofs and chief/chiefs. Specific irregular plurals listed are for child/children, man/men, woman/women, foot/feet, tooth/teeth, goose/geese, mouse/mice, louse/lice, ox/oxen, fish/fish, sheep/sheep, and deer/deer.