如:boxes,glasses,dresses,watches,wishes,faxes 三)1)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 2)以元音字母加y结尾的直接加s。如:day-days,boy-boys,toy-toys,key-keys,ways 四)以o结尾加s(外来词)。如:radios...