一般情况下名词的复数后直接加-s
bike→bikes girl→girls apple→apples boy→boys Walkman→Walkmans
末尾字母是s、x、ch、sh时加-es
bus→buses class→classes chess→chesses minibus→minibuses dress→dresses waitress→waitresses glass→glasses address→addresses
box→boxes fax→faxes pencil-box→pencil-boxes
matchmatches watch→watches peach→peaches beach→beaches lunch→lunches stomach→stomaches sandwich→sandwiches
brush→brushes wish→wishes
末尾字母是o时，分自然界生长有生命的加-es，非自然界生长的无生命（人造）的加-s
hero→heroes Negro→Negroes mango→mangoes tomato→tomatoes potato→potatoes
radio→radios photo→photos piano→pianos zoo→zoos yo-yo→yo-yos
末尾字母是y时，“元音+y”时直接加s，“辅音+y”时变y为i加es
boy→boys monkey→monkeys key→keys way→ways play→plays toy→toys Monday→Mondays day→days holiday→holidays
story→stories study→studies party→parties family→families library→libraries diary→diaries city→cities country→countries hobby→hobbies baby→babies strawberry→strawberries firefly→fireflies butterfly→butterflies dragonfly→dragonflies history→histories
末尾字母是“f”或“fe”时变复数末尾以“ves”结尾
wife→wives wolf→wolves knife→knives life→lives half→halves thief→thieves hankerchief→hankerchieves housewife→housewives leaf→leaves
以man结尾的单词“有生命的”变man为men，无生命的Walkman特殊
man→men woman→women policeman→policemen policewoman→policewomen snowman→snowmen 但Walkman→Walkmans

感谢楼主的无私奉献,非常好!