序数词七上U8(答案)教案

课程名称：序数词教学内容：1.序数词定义及常见的基数词变序数词2.序数词的用法教学对象：初一学生教学目标：1.掌握常见的基数词变序数词2.掌握序数词的用法教学重难点：序数词的用法复习写出下列单词的基数词形式。

序数词 知识卡片1 1.基础定义：序数词：表示事物的顺序的词叫序数词。

如第一first 、第二second 、第三third 等。

2. 基数词变序数词 A.1-19基数词变序数词①特殊：第1至第3 ，one →first ； two →second ；three →third ； ②规律：第4至第19均在相应的基数词后加­th （5，8，9，12除外）。

练习写出下列几组基数词的序数词1. one two three2. Five → fi eight →eigh nine → nintwelve →twel3. six seven thirteenve 要用f替fourteen fifteen sixteenseventeen eighteen nineteenB.20-90的整十的基数词变序数词。

规则：把对应的基数词的最后一个字母y变为ie，再加­th，如twenty—twentieth等。

练习写出下列基数词的序数词1.twenty →twent2.sixty—3.seventy—4.eighty—5.ninety—C.21-29；31-39；...91-99二十以后的非整十的两位或两位以上的基数词变序数词规则：只将个位数变为序数词，如twenty-one—twenty-first，thirty-four—thirty-fourth 等。

D.100基数词变序数词。

规则：直接加-th。

练习写出下列基数词的序数词1.twenty­one →twenty­2.twenty-two →twenty-3.twenty­five →4.thirty-four→5.forty-seven →6.fifty-nine →7.ninety-eight →8.one hundred →总结：随机检测：写出对应的序数词知识卡片2序数词的缩写：由阿拉伯数字加上序数词的最后两个字母构成。

如：fir st→1st第一；seco nd→2nd第二；thi rd→3rd第三；four th→4th第四；fif th→5th 第五....练习：一，写出下列基数词的序数词缩写：one two threetwenty-one twenty-two twenty-three seventy eighty twenty-seven seventeen fifteen twelve二，写出下列序数词的完整形式。

1.1st ___________________2.2nd ___________________3. 3rd ___________________4. 4th ___________________5. 20th ___________________6. 8th ___________________7. 9th ___________________3.写出对应的序数词缩写典例:1.January is the first month of the year.2.February is the second month of the year.3.Cindy was the second student to get to school this morning．练习：1.—Which floor? —_____ fifth floor.A.aB.anC.theD. /2.___month of the year is May.A.TwoB. The secondC.FiveD. The fifth3.There are(twelve) books on the bookcase. The(eight) book is about animals.4.The Yellow River is the (two) longest river in China.二.序数词常用作名词的定语，但当名词前已经有形容词性物主代词等限定词时，则不再用定冠词the。

her fourth birthday 她的四岁生日例题：1.You are ____ my first good friend here. A.the B./2.Wang Yaping，China's second woman astronaut（宇航员），gave us students a lesson about space science（太空科学）last year． A.the B./三.表示编号，“the+序数词+名词”。

第五课the fifth lesson例题：1.______house is my house.A.The fifthB.FifthC.The fivethD.Five练习：1.March is the __________month of the year.2.July is the ____________ month of the year.四.表示日期，几月几号：“月份+序数词”。

练习:1.Her birthday is on May (five).2.-When is your mother’s birthday?-It is on .A.February eighths B July thirty-third C February 7th D March nineth3.Today is Friday, November.A. nineB.ninethC.ninthD.ten4. He goes home on June ____________.A.twenty-fiveB.twenty-fifthC.twenty five用英文写出下列日期：８月１２日９月２７日３月２０日５月１８日五.表示分数：基数词和序数词可以构成分数。

其中基数词表分子，序数词表分母。

注意：分子大于1，分母要用复数形式。

二分之一英语习惯表达one/a half，不说one second。

（1/4在7年级下册学到，老师们根据学生情况加减。

）如：one tenth 十分之一two hundredths 百分之二a third 三分之一five fourths 五分之四例题1._______________ of the students are girls in our class.A.One threeB.One threesC.One thirdsD.One third练习：1.In our class of the students are girls．A. three fifthB. three fifthC. three fifths D．three fifths六.表示“又一，再一”；当序数词前有a/an修饰时，此时译为“又一，再一”。

如：I had two apples，but I still want a third one.我吃了两个苹果了，但我还想再吃一个（第三个）。

例题A.aB.anC. theD./总结：1.基数词变序数词2.序数词的用法综合练习一、写出下列序数词的缩写形式或完整形式。

first－nineteenth－twenty-eight－3rd－12th－eleventh- twelfth-20th－80th－29th－二、单选1.It’s my ____ first time to go to the cinema.A.theB./C.oneD.a2. She is ____ first student to come to school.A.aB.anC.theD./A. Lesson ten-twoB. Lesson Ten-secondC. the Twelfth LessonD. Twelfth lessonA. twelfthB. the 12thC. 12th5. December the ____ is Christmas.A. twenty-fiveB. twenty-fifthC. twentieth-fiveD. twenty-five6.The teacher said that ______ of the boys would take part in the talent show.A.three fiveB.third fifthsC.three fifthsD.third five7.He has failed times，but he won't give up a chance．A.third，fourB.three，fourthC.third，fourth三、根据题意，填入合适的数词。

1.Sunday is the ( ) day of a week.2.September is the ( ) moth of a year.3.October the ( ) is National of a year.测评1.Autumn is _______________ season in a year.A.the fourthB.the thirdC.a thirdD.the threeth2.We had a special party for his _____ birthday yesterday night.A.twenty-secondB.the twenty-secondC. twenty-two3. March _____ is Women’s Day.A. eighthB. ninthC. tenthD. eight4.The Blacks have two children，but they would like to have ____ child．A.thirdsB.a thirdC.thirdD.three5.It is said that the gravity(引力) on the Mars (火星）is only about __________ of the gravity (引力)on the earth.A. three eighthsB. third eighthC. three eightsD. third eight作业：选择正确的序数词或基数词填空。

3. T oday is Friday, November ___________ (fifth / five).4.Go along this street and then get left at the ___________ (two/ second)crossing.5.The _________ (one/first) animal is a dragon.6.During the Olympics，the man passed his own________ （forty/fortieth） birthday.7.Mary asked me to repeat the telephone number _____ second time so that she could write it down.二．用下列基数词的正确形式填空。