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1、Lesson 12 How many are there?,pencil,This is one pencil.,pencils,These are many pencils.,chair,This is a chair.,chairs,These are many chairs.,名词单数变复数的规则1：,一般直接加s,box,This is a box.,boxes,These are many boxes.,bus,This is a bus.,buses,These are three buses.,名词单数变复数的规则2：,以s,x,sh,ch结尾的可数名词的复数形式通常在其后加es
2、.如class,bus,fox,dish,watch等,tomato,This is a tomato.,tomatoes,These are many tomatoes.,potato,This is a potato.,potatoes,These are many potatoes.,photo,photo,photo,This is a photo.,photos,These are many photos.,名词单数变复数的规则3：,以o结尾的名词，有生命的加es，无生命的加s但个别有生命的却加s如：1.negro(黑人)，hero（英雄），potato(土豆)，tomato（西红柿
3、）后加es；2.radio(收音机)photo(照片)后加s；3.特殊的kangaroo后加s.,man,These are men,woman,These are women,This is a child,These are children,名词单数变复数的规则4：,有一些单词变复数时改变其中的字母或词尾发生变化，如manmen womanwomen footfeet tooth（牙）teethgoosegus（鹅）geesechildchildren oxks（公牛）oxen等,知识延伸：名词单数变复数的规则5：1.以辅音y结尾的名词，要把y变成i，再加es.如：babybabies.
4、familyfamilies.2.以元音y结尾的名词，要直接加s如：boyboys.3.以 f 或 fe结尾的，要去掉f或fe,再加ves.如：wolfwolves,leafleaves，wifewives，knifeknives.4.单复数同形。如：sheepsheep(绵羊),deerdeer（小鹿）,people-people,ChineseChinese等,5.fish很特殊，fish用作可数名词指“鱼的条数”时单数和复数形式相同（two fish两条鱼），指“鱼的种类”时复数形式才为fishes（two fishes两种鱼）；fish用作不可数名词时无复数形式，意为“鱼肉”，Help
5、 yourself to some fish随便吃些鱼。）,一、,看图写单词.,1.These are _.,2.There are five _.,3.Here are many _.,4.These are _.,5.Here are some _.,6.Here are three _.,7.These are _.,children,pencils,dresses,women,stamps,buses,men,二改错：1This is one pencils.2.Look at these woman.3.There are five childs.4.There is many di
6、shes.5.How much pencils are there?6.How many book do you have?7.The students is reading books now.,(pencil),(women),(children),(are),(many),(books),(are),三改写句子：1This is a pencil.(复数)2.Here is a dish.(复数)3.These are some bedrooms.(单数)4.Here are two women.(单数),These are pencils.,Here are dishes.,This
7、is a bedroom.,Here is a woman.,小结：名词单数变复数的规则,1.一般直接加s2.以s,x,sh,ch结尾的可数名词的复数形式通常在其后加es.如class,bus,fox,dish,watch等。3.以o结尾的名词，有生命的加es，无生命的加s但个别有生命的却加s如：（1）.negro(黑人)，hero（英雄），potato(土豆)，tomato（西红柿）后加es；（2）.radio(收音机)photo(照片)后加s；（3）.特殊的kangaroo后加s.,4.以辅音y结尾的名词，要把y变成i，再加es.如：babybabies，familyfamilies.5.
8、以元音y结尾的名词，要直接加s 如：boyboys.6.以f或fe结尾的，要去掉f或fe,再加ves.如：wolfwolves,leafleaves，wifewifewives，knifeknives.7.单复数同形。如：sheepsheep(绵羊),deerdeer（小鹿）鹿）,people-people,ChineseChinese等。,8.有一些单词变复数时改变其中的字母或词尾发生变化，如：manmen womanwomen footfeet tooth（牙）teeth goosegus（鹅）geese childchildren oxks（公牛）oxen等 9.fish很特殊：fish用作可数名词指“鱼的条数”时单数和复数形式相同（two fish两条鱼）。fish指“鱼的种类”时复数形式才为fishes（two fishes两种鱼）。fish用作不可数名词时无复数形式，意为“鱼肉”，Help yourself to some fish随便吃些鱼。）,
