一般变化直接在词尾+s
a girl girls
a boy boys
a book books
变化规则1
以s/sh/x/ch结尾的直接在词尾+es
a bus buses
a brush brushes
a box boxes
a bench benches
变化规则2
以f/fe结尾，变f/fe为ves
a wife wives
a shelf shelves
a knife knives
a leaf leaves
变化规则3
以f/fe结尾，有时+s
a roof roofs
a cliff cliffs
a proof proofs
a chief chiefs
变化规则4
原音+o结尾，+s/z/
a zoo zoos
a radio radios
辅音+o结尾， +es/z/
a hero heros
a potato potatoes
a tomato tomatoes
不规则1
a sheep sheep
a deer deer
an aircraft aircraft
a swine swine
a fish fish
不规则2
a man men
a woman women
a tooth teeth
a foot feet
a goose geese
不规则3
a child children
a mouse mice
an ox oxen
a phenomenon phenomena
a formula formulae
