2.不规则变化:man→men, woman→women, sheep→sheep,tooth→teeth, fish→fish, child→children, ox→oxen, goose→geese
不可数名词一般没有复数形式,说明其数量时,要用有关计量名词。如:a bag of rice→two bags of rice, a piece of paper→three pieces of paper, a bottle of milk→five bottles of milk.