名词单数变复数Whats this in English?Its an apple.What are these?They are two apples.-What are these?-Whats this? -Its a pen.-They are pens.-What are those?-Whats that? -Its an English book.-They are English books.backpacks watchesoranges pens-Whatre these ?-Theyre .mapscaseskeys-Whatre those ?-Theyre .单数复数可数名词如 何 变 化？规则变化不规则变化规则变化1.一般情况下，直接在词尾加-s 构成复数形式。 carbackpackcarsbackpacksbookbooksnamepencardrulernamespenscardsrulers练习一dog- - duck- - chair- - table- band- - window - banana - tree- -dogs ducks chairs tables hands windows bananas treesbox2. 以s, x, ch, sh等结尾的名词 ，在词尾加-es构成复数形式 。boxesclassclasseswatchwatches brushbrushess xshchbusbusesfoxesfox (狐狸) dish (盘子)dishes练习二 glass- box- - brush- - match- - class- - bus- watch-nglasses nboxes nbrushes nmatche s nclassesnbusesnwatches综合练习一 glass- desk- school- box- brush- hen- match- class- bus- eye- watch-nglasses ndesks nschools nboxes nbrushes nhens nmatches nclasses nbuses neyes nwatches3. 以“辅音字母+y”结尾的名词， 应改y为i，再加-es。familyfamiliescomediescomedy (喜剧)yyld4. 以“元音字母+y”结尾的名词， 直接在词尾加-s构成复数形式 。boyboysdaydaysoayykeycitiesstrawberrieskeyscity (城市) strawberry (草莓)练习三 city- - day - - boy - - family - - key- - strawberry - baby - - ncities ndays nboysnfamilies nkeysnstrawberries nbabies 综合练习二 strawberry key- glass - bus - boy - eye - watch - city - school -nstrawberries nkeys nglasses nbuses nboys neyes nwatches ncities nschoolsnbox - nbaby- nfamily- nbrush- nmatch- nclass- ndesk- nhen- nday -nboxes nbabies nfamilies nbrushes nmatches nclasses ndesks nhens ndays 5. 以f或fe结尾的名词，先将f或fe 变成v，再加-es构成复数形式。knifekniveshalfhalves“小偷”(thief)的“妻子”(wife)用“刀子”(knife)和 “树叶”(leaf)把“狼”(wolf)劈成两“半”(half)。wivesleaveswolveswife (妻子) leaf (树叶) wolf (狼)roof (屋顶)roofsroof“小偷”(thief)的“妻子”(wife)用“刀子”(knife)和“树叶”(leaf)把“狼”(wolf)劈成两“半”(half)。巧记一：妻子持刀去宰狼，妻子持刀去宰狼，小偷吓得发了慌；小偷吓得发了慌； 躲在架后保己命，半片树叶遮目光。躲在架后保己命，半片树叶遮目光。 按：wife（妻子），knife（小刀），wolf（ 狼），thief（小偷），shelf（架子），self （自己），life（生命），half（一半）， leaf（树叶）。 由self构成的复合词，其变化与self相同（如 myselfourselves；yourselfyourselves； himelf，herself，itselfthemselves）。巧记二：练习四wife- knife- wolf- thief- - shelf- self- life- half- leaf-wives knives wolves thieves shelves selves lives halves leaves综合练习三 wife- key- - glass- knife- boy- eye- watch- city- - school-nwives nkeys nglasses nbuses nboys neyes nwatches ncities nschoolsnbox- nbaby- nfamily- nbrush- nmatch- nclass- ndesk- nhen- nday- nboxes nbabies nfamilies nbrushes nmatches nclasses ndesks nhens ndays6. 以o结尾的名词，有的加-s, 有 的加-es构成复数形式。 photophotosheroestomatoeszooszoo(动物园) tomato(西红柿) hero (英雄)以o结尾的名词, 表示无生命事物的名词，词尾加-s, 表示有生命事物的名词，词尾加-es 。加-es的名词有:potato, tomato, hero 巧记:英雄爱吃土豆炖西红柿。练习四 piano- - zoo- - potato- - photo- - tomato - radio- -npianosnzoosnpotatoesnphotosntomatoesnradios Sum up:1.一般情况下,直接在名词词尾加-s.2.以s,x,sh,ch结尾的名词,在词尾加- es.3.以辅音字母加y结尾的名词，要变y为i再加-es. 5.以f或 fe结尾的名词，先将f或 fe变为v,再加-es.6.以o结尾的名词,表示无生命事物的名词加-s,表示有生命事物的名词加-es。4.以“元音字母+y”结尾的名词，直接在词尾加-s .给下列可数名词加复数bird- card- lady-orange- ruler- photo- - friend- boy- watch- - girl- case- cat- wife- tree- key- bed- hero- family - dictionary- question- leaf- party- cup-birdsladies orangesrulerscatsboys girlscases wiveswatchestreeskeysquestionsbedsheroesfriendsfamilies dictionariesphotoscardsleavespartiescups综合练习三nfamilies nknives nbooks nbeds nwolves nbuses nshelves nzoos npotatoes ncities nphotos nleaf npiano nbox ntomato nbrush nwatch nbag ncat nradio nboy nstrawberrynleaves npianos nboxes ntomatoes nbrushes nwatches nbags ncats nradios nboys nstrawberries nfamily nknife nbook nbed nwolf nbus nshelf nzoo npotato ncity nphoto 不规则名词复数变化一 deer- sheep- foot-tooth- goose - fish- Chinese- Japanese-deer sheep feet teeth geese fish Chinese Japanese不规则名词复数变化二man-woman- policeman- mouse-child-men women policemen mice childrenthis that I you he / she / it am / is thesethos