單復同形 如：
deer,sheep,fish,cattle, deer, salmon, Chinese,Japanese
較特殊的有:
child---children
foot---feet
tooth---teeth
mouse---mice
man---men
woman---women
thief thieves
shelf shelves
leaf leaves
calf calves
half halves
wolf wolves
wife wives
life lives
以sh,ch,s或x結尾的話,那就要在單數(shù)的后面加上es
lash lashes 鞭子
push pushes
branch branches
match matches
coach coaches
gas gases
ass asses
class classes
box boxes
fox foxes
如果名詞結尾是一個子音(consonant,就是除了a,e,i,o,u之外的字母)加一個y, 那就要將y換成i,再加上es
baby babies
family families
pony ponies
city cities
country countries
如果名詞結尾是一個母音(vowel,就是a,e,i,o,u)加一個y,那只要在單數(shù)詞后加一個s就成了
play plays
way ways
valley valleys
donkey donkeys
toy toys
boy boys
guy guys