1) 以y结尾的专有名词,或元音字母+y 结尾的名词变复数时,直接加s变复数:
如:two Marys、the Henrys、monkey-monkeys、holiday-holidays
比较: 层楼:storey-storeys、story-stories
2) 以o 结尾的名词,变复数时:
a. 加s,如:photo-photos、piano-pianos、radio-radios、zoo-zoos
b. 加es,如:potato-potatoes、tomato-tomatoes
c. 均可,如:zero-zeros / zeroes
3) 以f或fe 结尾的名词变复数时:
a. 加s,如:belief-beliefs、roof-roofs、safe-safes、gulf-gulfs
b. 去f,fe 加ves,如:half-halves、knife-knives、leaf-leaves、wolf-wolves、wife-wives、life-lives、thief---thieves
c. 均可,如:handkerchief-handkerchiefs / handkerchieves