初中英语语法讲解数词的用法

数词热身练习1._______tresswereplantedonthemountainlastyear.

A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2．______ofthestudentsaregirlsinourclass．

A．Twothree

B．TwothreesC．Twothirds

D．Secondthree3.Whenwasheborn?hewasbornon________.

A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober数词的构成基数词的构成1）1－12,独立成词。

onetwothreefourfivesixseveneightnineteneleventwelve2）13--19,由3－9+teen构成。

14–fourteen16--sixteen17--seventeen19—nineteen

特殊拼写:13–thirteen15--fifteen18—eighteen

3）20－90,以-ty结尾。

20—twenty30thirty40—forty50—fifty80eighty

60sixty70seventy90—ninety

4）21－99，两位数，十位与个位之间有“－”。

21twenty—one55fifty—five99ninety—nine5）101—999，三位数，百位与十位/个位之间加and。

101onehundredandone840eighthundredandforty693sixhundredandninety-three

29,43150076,,thousandhundredmillionbillionand6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion基数词的构成1.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolseveral__studentsareabletosearchtheInternet.A.hundredofB.hundredsofC.hundred3.Many__sheepwerekilledintheaccident.A.thousandsofB.thousandC.thousands4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetoworkinit.A.hundred;hundredsB.hundreds;hundredsC.hundreds;hundred序数词的构成1)1－3,first,second,third。2)4－19,相应基数词+th,

特殊拼写:fifth,eighth,ninth,twelfth。3)20－90,y变成ie+th,如twentieth。4)21－99,只把个位的基数词变成序数词如twenty-first。5)序数词缩写数字＋最后两字母

如1st,2nd,3rd,4th…基变序,有规律,一、二、三，特殊记，面目全非要注意，加th从4起，八少“t”，九去“e”，“ve”要用“f”替，(five,twelve)见“y”变成“i”和“e”，词尾加上“th”，(twenty,thirty,……ninety)若是遇到几十几，只变个位就可以。序数词缩写记清楚,数字后跟两字母。(序数词构成规律)基数词的用法1、表示具体数目,hundred,thousand,million不用复数

表示不确定数目,用复数。即hundredsof(数百),thousands

of(数千),millionsof(数百万)+名词复数,

可以用many/several修饰，但不能与具体数目连用。

1)Ourcountryhasapopulationof1,300million

people.2)Therearethreethousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.2、“几十”的复数形式可以表示：

在某人几十岁时in+one’s+整十基

数词复数年代in+the+数词复数

1)Hediedinhisforties．四十多岁

2)Inthenineties,mostpeoplegotoworkbybike.90年代3、“基数词+名词”的合成形容词作定语，中间有连字符“－”,当中的名词用单数。

a3–year–oldgirlaseven-dayholiday

4、表计量--“基数词+度量单位+形容词”

Theclassroomis7meterslong,6meterswideand3metershigh.1.

Thewinneris___.Heisan___boy.A.eight-year-old;eightyearsoldB.eightyearsold;eight-year-oldC.eight-yearsold;eight-year-old2.HecametoChina____.A.attheageof20B.whenheis20C.atageof20年龄3.Hegraduatedin__of__century.A.thesixtieth;twentyB.sixty;thetwentiethC.thesixties;thetwentieth4.Hegottheprize__.A.inhisfiftiesB.infiftiesC.inhisfifty

5、表示时刻(介词用at)1)顺读法先时后分,“几点几分”

9:30ninethirty6:21sixtwenty-one

3)

15分钟：aquarter30分钟：ahalf

9:15aquarterpastnine12:30halfpasttwelve

表示“整点”时，在基数词后加o’clock;

9:00o’clock

2)逆读法先分后时

表示“几点过几分”，半小时以内，介词用past

分钟数+past+钟点数

10:10tenpastten8:20twentypasteight表示“几点差几分”，半小时以上，介词用to

60减原分钟+to+(下一个)钟点数

9:50tentoten7:40twentytoeight(1)序数词作定语，前面要加the；

Thefirsttruckiscarryingafoodbasket．

Johnlivesonthefifteenthfloor．

SheismyfirstEnglishteacher.(2)有时加a/an，“再一”，“又一”的意思We‘llhavetodoitasecondtime．ShallIaskhimathirdtime？

WhenIsatdown，afourthmanrosetospeak．Theyhadasecondchildin1988序数词的用法编号表示法编号在前，名词在后，用序数词，前面有the编号在后，名词在前，用基数词，注意首字母大写房间号码和电话号码要一个一个分别读TheFirstLesson（在句子中不大写）LessonOnethethirty-secondpagePage32/PageThirty-twoRoom305BusNo.12=theNo.12bus第一课第32页第305房间第12路公共汽车15分子基数词分母序数词onefifth27分子﹥1分母+stwosevenths14分子a分母quarteraquarter34threequarters12ahalf13three

andonethird3基数词+and+分数分数百分数80%基数词+percenteightypercenthalf/(百)分数+of+可数名词复数谓语动词用复数half/(百)分数+of+不可数名词谓语动词用单数3.78threepointseveneightDiscount，off用于表示“打折”打六折40%offa40%discount1.

__ofthestudents__boysinClassA.Twothree;areB.Twothirds;areC.Twothirds;is2.

__ofhermoney__spentonclothes.A.Twothree;areB.Twothirds;isC.Twothird;is3.__theteachersinourschoolisaboutonehundred,and__ofthemarewomenteachers.A.Thenumberof;twothirdB.Thenumberof;twothirdsC.Anumberof;twothirds一个半小时两个半小时twoandahalfhours=twohours

andahalfoneandahalfhours=onehourandahalf半的表示法1.

Theboyalwaysstaystherefor__.A.oneandhalfhourB.oneandahalfhourC.oneandahalfhours2.

Theoldmandrank__beer.A.twobottlesandahalfB.twoandahalfbottleC.twobottleandahalf1999nineteenninety-ninetwothousandandeight1949年10月1日读作:

October(the)first,nineteenforty-nine(月-日，年)thefirstofOctober,nineteenforty-nine（日-月，年）写作:October1st,1999(日用缩写，月-日-年)

October1,1999(日用数字)

1stOctober,1999日-月，年年份、日期表达法年用基数词表示,两位一读,介词用in日用序数词表示,介词用on

1.Theaccidenthappenedon___.A.April5,2001B.2001,April5C.April2001,52.Iwasborn___.A.inMarch8,1993B.onJuly9,1994C.onMay,199520世纪90年代inthe1990s数词的表示法—

年代世纪inthenineteennineties表示“在…世纪”,用序数词。在20世纪写作：in

20thcentury

读作：inthetwentiethcentury1.Therewillbemorechancesin__centurythanin__century.A.twenty-one,twentyB.twenty-first,twentiethC.thetwenty-first,thetwentieth2.Thecitychangedalot___.A.in1980sB.inthe1980sC.inthe1980一倍once，两倍twice，三倍threetimes(三倍或以上基数词＋times)数词的表示法—

倍数

Thisboxisfivetimes

asbigasthatone.=Thisboxisfourtimesbigger

thanthatone.①

A+be+倍数

+as+adj.原+as+B.A是B的…倍…②

C+be+倍数

+adj.比+than+D.C比D…

…倍1.

Thisbuildingis__thatbuilding.A.threetimeastallasB.twicetallerthanC.threetimesastalleras2.

我的箱子比你的重六倍!Myboxis____________________yours.

sixtimesheavierthanseventimesasheavyas6+5＝11Sixplusfiveiseleven或Sixandfiveiseleven.11-6＝5Elevenminussixisfive.

4×5＝20Fourmultipliedbyfiveistwenty.或Fourtimesfiveistwenty.20÷4＝5Twentydividedbyfourisfive.

加减乘除式的表达方法

选择填空。

1．Marchis____monthofayear．

A．athreeB．thethirdC．athird

2．Wewillhaveameetingat8:05____．

A．fivetoeightB．eightfiveC．eightofive

3．Eightpluseightis____.

A．sixteenB．sixty-fourC．one

4．Heisan____boy．

A．eightyearsB．eight-year-old

C．eight-years-old

5．Wewillhavea___walk．

A．tenminutesB．tenminutes'

C．ten-minutesB．thethirdC．eightofiveA．sixteenB．eight-year-oldB．tenminutes'6．Thewallis____.

A．fourmeterslongB．fourmeterlongC．four-meterlong7．What'sthedatetoday?It's___．

A．MarchtheeightB．Marcheighth

C．eight，March

8．Ithappenedinthe1040's．

A．inthefortiesoftheeleventhcentury．