可數(shù)名詞變復(fù)數(shù)
1)單數(shù)名詞加s:students,apples,bags,trees,books,brothers.
　　2)以s、x、sh、ch結(jié)尾的名詞加es:glasses,boxes,brushes,matches.
　　3)以輔音字母加y結(jié)尾的名詞,變y為i加es:cities,babies,enemies.
4)以f或fe結(jié)尾的名詞,多數(shù)變f為v加es:wives,knives.但有些詞只加s:roofs,proof s,chiefs.
5)以o結(jié)尾的名詞,有些加es:Negroes,heroes,tomatoes,potatoes;其它加s:radio s,zoos,pianos,photos; zero加s,es均可.
　　6)不規(guī)則名詞：
*foot→feet,goose→geese,tooth→teeth,child→children,man→me n,woman→women,mouse→mice;
*單復(fù)數(shù)同形：sheep,deer,fish,Chinese,Japanese,li,jin,mu,yuan；
*人民幣除元、角、分外,美元、英鎊、法郎等都有復(fù)數(shù)形式;
*集體名詞,以單數(shù)形式出現(xiàn),但實(shí)為復(fù)數(shù).如：people　police　cattle 等本身就是復(fù)數(shù),不能說 a people,a police,a cattle,但可以說a person,a policeman,a head of cattle;
*the English,the British,the French,the Chinese,the Japanese,the Swiss 等名詞,表示國民總稱時(shí),作復(fù)數(shù)用.如：The Chinese are industries and brave.　中國人民是勤勞勇敢的.
*表示由兩部分構(gòu)成的東西,如：glasses (眼鏡)　trousers,　clothes若表達(dá)具體數(shù)目,要借助數(shù)量詞 pair(對(duì),雙);　suit(套); a pair of glasses; two pairs of trousers.
*另外還有一些名詞,其復(fù)數(shù)形式有時(shí)可表示特別意思,如：goods貨物,waters水域,fishes（各種）魚.
　　7)某些外來詞變復(fù)數(shù)：datum→data,medium→media,bacterium→bacteria,curriculum→curricula,criterion→criteria,phenomenon→phenomena.(um/on→a)analysis→analyses,basis→bases,crisis→crises,diagnosis→diagnoses.(is→es )
　　8)復(fù)合名詞變復(fù)數(shù)：以不可數(shù)名詞結(jié)尾的復(fù)合名詞無復(fù)數(shù)形式,如：homework.
　　以man或woman為前綴的復(fù)合名詞變復(fù)數(shù),前后兩個(gè)名詞都變復(fù)數(shù),如：manservant→menservants,woman student women students.
　　其它復(fù)合名詞變復(fù)數(shù)：grownup→grownups,brotherinlaw→brothersinlaw,standby→standsby.
　　9)復(fù)合形容詞做定語時(shí),其中的名詞保持單數(shù)：a sixyearold boy,a twohundredpage book