1、在後面加s。如:fathers,books,Americans,Germans,apples,bananas。
2、x,sh,ch,s,tch後加es。如:boxes,glasses,dresses,watches,wishes,faxes。
3、以輔音字母加y結尾的變y爲i再加es如:baby-babies,family-families,duty-duties,comedy-comedies,documentary-documentaries,story-stories。