三、如果名词结尾是辅音字母加一个y,那就要将y换成i,再加上es;如果以元音字母加y结尾,只要在单词后加s。(元音字母:A,E,I,O,U)
辅音字母加y
baby- babies
family- families
pony- ponies
city- cities
country- countries
元音字母加y
play- plays
way- ways
valley- valleys
donkey- donkeys
toy- toys
boy- boys
guy- guys
五、当单数名词的结尾是f或fe时,复数的写法就是将f改为v,再加es
thief - thieves
shelf - shelves
leaf - leaves
calf - calves
half - halves
wolf - wolves
wife - wives
life- lives
可是,f结尾的单数字,有许多只需加个s就成复数
roof - roofs
hoof- hoofs
chief- chiefs
cliff - cliffs
gulf - gulfs
六、结尾是o的单数词,有的加s,有的需要加es,判断的标准是单词本身的意思,有生命的加es,没有生命的加s;结尾是oo的单词,只需要加s即可
无生命:
piano- pianos
photo- photos
有生命:
hero- heroes
mango- mangoes
potato- potatoes
volcano- volcanoes
buffalo- buffaloes
tomato- tomatoes
mosquito- mosquitoes
oo结尾:
bamboo- bamboos
zoo- zoos
kangaroo- kangaroos
七、其他一些不规则的变化
ox- oxen
child- children
analysis- analyses
basis- bases
datum- data
foot- feet
goose- geese
tooth- teeth
man- men
woman- women
mouse- mice
medium- media/mediums
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