1、在后面加s。如：fathers,books,Americans,Germans,apples,bananas。

　　2、x,sh,ch,s,tch后加es。如：boxes,glasses,dresses,watches,wishes,faxes。

　　3、以辅音字母加y结尾的变y为i再加es如：baby-babies,family-families,duty-duties,comedy-comedies,documentary-documentaries,story-stories。