2023学年完整公开课版数词

数词

1.定义：数词分为_______和_______。表示数目多少的数词叫基数词cardinalnumbers。表示顺序的数词叫序数词ordinalnumbers

。2.基数词又分为：___________和_____.

表示数目多少或顺序多少的词叫数词。基数词序数词整数分数小数

基数词

1基数词写法和读法：345

2基数词一般是单数形式，但下列情况，常用复数：a.与of短语连用，表示概数，不能与具体数目连用，如成千上万的人b.在一些表示"一排"或"一组"的词组里；如：他们三三两两的到达了。c.在乘法运算的一种表示法里，如：

3x5=15d年代、年龄等的表达。二十世纪八十年代在他三十几岁时3.负数表达法：-25

Threefivesisfifteen.inhisthirtiesthe1980s或1980’sTheyarrivedintwosandthrees.thousandsofpeoplethreehundredandforty-fiveminustwenty-five

4.倍数表示法(了解)a.倍数/或分数+as+adj.+as我有你三倍那么多。b.倍数/分数+thesize(amount,length…)of…地球是月球的49倍。c.倍数/分数+形容词/副词比较级+than…今年比去年粮食产量增加8%。d.还可以用by+倍数，表示增加多少倍今年粮食产量增加了4倍。

Ihavethreetimesasmanyasyou.Theearthis49timesthesizeofthemoon.Thegrainoutputis8percenthigherthisyearthanthatoflastyear.Thegrainoutput

hasbeenincreasedbyfourtimesthisyear.

4.分数表达法规则：分子用基数词,分母用序数词;当分子>1时,分母用复数。百分比则用基数词加percent即可。3/4----7/20---1/3---80%---分数修饰可数名词单数时，名词作______。分数修饰可数名词复数时，名词作______。分数修饰不可数名词时，名词作________。1.2/3ofthebooksinourlibrary___inEnglish.(be)2.7/10oftheearth_____coveredwithwater.(be)3.4/5oftherice_______(smell)bad.three-fourths/threequartersseven-twentiethsone-thirdeightypercent单数复数单数areis

smells5.小数表达法以小数点为界，小数点左首的数字为一个单位，表示整数，数字合起来读;小数点右首的数字为一个单位，表示小数，数字分开来读;小数点读作point,o读作zero或o[əu],整数部分为零时,零可以省略不读。

0.425.67l.03当数字值大于1时，小数后面的名词用作_____;数字值小于1时，小数后面的名词用作______。

zeropointfour或pointfourtwenty-fivepointsixsevenonepointothree复数单数基数词变为序数词的规律：123456789101112131415161718192132986040总结个位数，十几，几十几。和几十变为序数词的规律。基数词＋th=序数词firstonesecondtwothreethirdfour

thfithvefthsixhththseveneightnineteneleventwelthirteenfourteenfifteenththththththfvesixteenseventeeneighteenththhththththnineteenfirst

twenty-secondthirty-ninety-eightonetwoieiesixtfortyy

练习：20________________99_________12____________21_____________45_____________33_______________

twentiethninety-ninthtwelfthtwenty-firstforty-fifththirty-third习题1.______peoplevisitthismuseumeveryday.A.HundredB.HundredsC.HundredofD.Hundredsof2.Therearetwo___peopleinthemeetingroom.A.hundredB.hundredsC.hundredsofD.hundredof3.____thetreesinourschoolhavebeencutdowninthepast10years.A.ThousandsofB.TwothousandsC.ThousandofD.Twothousandof

DAD4.Thereare___daysinayear.threehundredssixty-fiveB.threehundredsandsixty-fiveC.threehundredandsixty-fiveD.threehundredandsixtyfive5.Look!Thereare___inthesky.A.thousandstarsB.thousandofstarsC.thousandsofstarsD.thousandsofstar6.Mybrotherisin____.A.ThreeClass,OneGradeB.ClassThree,GradeOneC.GradeOne,ClassThreeD.classthree,gradeone

CCB7.Wecansaythenumber78,645inEnglishlikethis____.A.seventy-eightthousandandsixhundredandforty-fiveB.seventy-eightthousandsixhundredandfortyfiveC.seventy-eightthousandsixhundredandforty-fiveD.seventyeightthousandsixhundredandforty-five8.DuringWorldWarⅡ，aJewishladywasprotectedbyalocalfamilyinShanghaiinher______.A.fiftiethB.fiftyC.fiftiesD.thefiftieth9.ItissaidthegravityonMarsisonlyabout__ofthegravityonEarth.A.three-eighthsB.third–eighthC.three-eightsD.third-eight

CCA10.Eachofushastowritea___reporteveryweek.A.two-hundred-wordB.twohundredthwordC.two-hundred-wordsD.twohundredwords11.Whenspringcomes,_______treesareplanted.amillionofB.millionsofC.millionsD.twomillions12.__________oftherice_____bad.A.Two-seventh,isB.Two-sevenths,areC.Two-sevens,isD.Two-sevenths,is

ABD在英国，楼房的第一层叫做,第二层叫,依次类推。而在中国美国及其它国家，楼房的第一层叫做

,第二层叫,依次类推。而在地面下，依次为地下一层地下二层等。

thegroundfloorthefirstfloorthefirstfloorthesecondfloor