Dear Log
Because I keep forgetting:
singular plural
plain boy boys
possessive boy's boys'
plain elf elves
possessive elf's elves'
plain criterion criteria
possessive criterion's criteria's
plain crisis crises
possessive crisis's crises's
plain child children
possessive child's children's
plain man men
possessive man's men's
plain woman women
possessive woman's women's
plain person people
possessive person's people's
(etc)