以辅音字母加y结尾的名词，变复数,要把改y为i,再加es
例如:city-cities，factory-factories
country-countries,family-families,lady-ladies
.1．一般名词复数是在名词后面加上“s”,如map→maps,bag→bags等；
2．以s,sh,ch,x等结尾的词加“es”,如bus→buses,watch→watches等；
3．以辅音字母＋y结尾的词,变y为i加es,如baby→babies等；以元音字母＋ y结尾的名词变复数时,直接加s变复数,如monkey→monkeys,holiday→holidays,storey→storeys（楼层）；
4．以o 结尾的名词变复数时：a）加s的名词有:photo→photos,piano→pianos,radio→radios,zoo→zoos b）加es的名词有：potato→potatoes,tomato→tomatoes ,hero-> heroes
5．以f或fe结尾的名词变复数时：a）加s的名词有：belief→beliefs roof→roofs safe→safes gulf→gulfs b）去掉f,fe 加ves的名词有：half→halves knife→knives leaf→leaves wolf→wolves wife→wives life→lives thief→thieves不规则变化：（常见的有）child-> childrenfoot-> feettooth-> teethman->menwoman-> women