可数名词有单数和复数两种形式。指一个人或一件事物时，用单数形式；指两个或多个人或事物时用复数形式。名词由单数形式变成复数形式的规则如下： 1. 一般的名词词尾直接加-s 。如： book → books room → rooms house → houses day → days 2. 以s, ss, ch, sh, x 结尾的名词，在词尾加-es 。如： bus → buses glass → glasses watch → watches dish → dishes box → boxes 3. 以"辅音字母+y"结尾的名词，要先将y改为i再加-es。如： city → cities body → bodies factory → factories等等。 4. 以f 或fe 结尾的名词，要将f或fe改为v再加-es。如： half → halves leaf → leaves knife → knives wife → wives 5. 特例 [悄悄话：特例常常考，要记住。] ① child → children ② man → men woman → women policeman → policemen (规律：man → men) ③ tomato → tomatoes potato → potatoes [悄悄话： 初中英语以o 结尾的名词变复数时只有这两个词加-es，其余的当然加-s喽！如：photo → photos ] ④ foot → feet tooth → teeth [悄悄话： oo变成ee。] ⑤ sheep, Chinese, Japanese单、复数同形 [悄悄话：变复数时词形不变。] ⑥ people单数形式表示复数意义，要求谓语动词用复数； people的复数形式peoples通常指"多个民族"。 三、 不可数名词的家务事 1. 不可数名词没有复数，当它作句子的主语时，谓语动词要用单数形式。如： The food is very fresh. 食品很新鲜。 2. 有的不可数名词也可以作可数名词，有复数形式，但他们的意义往往发生变化。如： water (水) → waters (水域) orange (橘汁) → oranges (橘子) 3. 很多的不可数名词表示泛指时为不可数，表示种类时就可数，但意义大多不发生变化。如： fruit → fruits food → foods fish → fishes hair → hairs 用所给名词的适当形式填空。 1. How many________(sheep) are there on the hill? 2. There is some________(food) in the basket. 3. The baby has only two________(tooth) now. 4. There is a lot of________(water) in the bottle. 5. There are five________(people ) in his family. 6. Let's take________(photo), OK? 7. I have lots of________(tomato) here. 8. The________(leaf) on the tree turn-yellow. 9. The________(child) are playing games on the playground now. 10. Their________(dictionary) look new. 11. I see you have a few white________(hair). 12. They are________(woman) doctors. 13. Can you give me some bottles of ____ (orange), please? 14. There are many________(fox) in the picture. 15. I would like some apple________(juice). I am very thirsty. 把下列单词变成复数 1.tomato_______________ 2.museum_______________ 3.watch_______________ 4.fish_______________ 5.people_______________ 6.brush_______________ 7.man_______________ 8.leaf_______________ 9.bus_______________ 10.library_______________ 本文来源：https://www.wddqw.com/doc/a0de6450b6360b4c2e3f5727a5e9856a5612262a.html