一、单数、复数★★★★★ 1.is(复数) are 2.are(单数) is 3.story(复数) stories 4.body(复数) bodies 5.plople(复数) people 6.am(复数) are 7.library(复数) libraries 8.factory(复数) factories 9.hobby(复数) hobbies 10.fish(复数) fish 11.man(复数) men 12.woman(复数) women 13.oranges(单数) orange 14.policeman(复数) policemen 15.policewoman(复数) policewomen 16.firemen(复数) firemen 17.firewoman(复数) firewomen 18.foot(复数) feet 19.tooth(复数) teeth 20.peach(复数) peaches 21.I(复数) we 22.you(复数) you
