八上U2数词练习

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八上U2数词的用法考点一基数词数字基数词形式例词0-12各自独立zero0;one1;nine9;twelve1213-193-9+重读teen结尾特殊：thirteen13;fifteen15;eighteen18一般加teenfourteen14;sixteen1620-90整十位数以ty结尾twenty20;thirty30;forty40;fifty50;sixty60;seventy70;eighty80;ninety90两位数几十几整十位数-个位数twenty-one21;thirty-five35;ninety-eight98三位数几百几hundredand+两位数sevenhundredandeighty-five785;twohundredandten210多位数从右向左数起每隔三位数加一个逗号依次为thousand(千)million(百万)billion(十亿),逗号中间三位数76,832,154,968seventy-sixbillioneighthundredandthirty-twomilliononehundredandfifty-fourthousandninehundredandsixty-eight考点二序数词数字序数词变化规则例词1、2、3不规则变化first第一;second第二；third第三4-19基数词词尾加th特殊fifth第五eighth第八ninth第九twelfth第十二fourth第四；nineteen十九20、30……90ty变为tie再加thtwenty→twentieth第二十ninety→ninetieth第九十两位数或多位数整数除外只变个位数(hundred,thousand等只在词尾加th)twenty-third第二十三onehundredandfifty-ninth第一百五十九hundredth第一百【温馨提示】(1)序数词要加定冠词the，但若序数词前有形容词性物主代词或名词所有格时省略the。Tommadethemistakeforthethirdtime.=ItwasTom’sthirdtimetomakethemistake.这是汤姆第三次出错。(2)序数词前加a/an表示“又一；再一”。EventhoughtheGreenshave3children,theystillwantafourthone.尽管格林夫妇已有3个孩子,可他们还想再要一个。(3)序数词可以用阿拉伯数字和序数词拼写的最后两个字母简写。例如1st第一2nd第二3rd第三4th第四。考点三数词应用名称表达法例词年份特别提示:年份的读法前两位数,再读后两位数,读日时要加the可先读1997年3月21日Marchthetwenty-first,nineteeninety-seven日期月日年日用序数年用基数日月年the+序数词+of+月+年2007年3月21日—thetwenty-firstofMarch,twothousandandseven年代in+the+数词的复数形式在18世纪20年代—inthe1720’s/1720s读作:intheseventeentwenties时刻时在前,分在后,按基数词读10:15tenfifteen分在前,时在后“几点过几分”用past分钟数须小于半小时,包括半小时在内7:05fivepastseven7:15fifteenpastseven7:30halfpastseven“几点差几分”用介词to,但分钟数须在半小时以内,不包括半小时在内7:57threetoeight11:46fourteentotwelve

12:40twentytothree几刻钟一刻钟:aquarter三刻钟:threequarters九点一刻:aquarterpastnine编号给东西编号时:序号在前用序数词lessontwelve=thetwelfthlesson序号在后用基数词分数分子用基数词:分母用序数词记忆口诀:分子基,分母序分子大于1,分母加s特别提示:通常二分之一用a/onehalf表示。四分之一用a/onequarter表示，三分之一onethirdtwothirdsfourfifthsseventenths带分数当分数前面带有整数时，要用连词and连接twoandtwothirds倍数英语用twice表示两倍,两倍以上用基数词加times表示twice两倍threetimes三倍fortytimes四十倍中考真题:Ⅰ.用所给数词的适当形式填空1.Ihavetriedthreetimes,andtheteacherasksmetohavea_______(four)try.2.(EvenachildknowsSeptemberisthe_______(nine)monthofayear.3.I’veboughtapresentformyfather’s_______(forty)birthday.4.Mr.Smithlivesonthe_______(six)floor.5.Climbuptothe_______(eleven)floor,andyoucanenjoyabetterview.Ⅱ.单项选择1.Thereare_______daysinaweekandTuesdayis_______dayoftheweek.A.seven;thirdB.seven;thethirdC.seventh;threeD.theseventh;three2.—Thereare60studentsinmyclassand44ofthemuseweiboveryoften.Thatmeansabout_______ofyourclassmatesareweibousers,right?A.halfB.onethirdC.twothirdsD.threequarters3.Eight_______studentsinourschoolarefromcountryside.A.hundredsB.hundredC.hundredsofD.hundredof4.Hewrotehis_______novelwhenhewas_______.A.five;fiftiesB.fifth;fiftyC.fifth;fiftieth5.July1stofthisyearis_______birthdayofCPC(中国共产党).A.ninetyB.theninetyC.theninetieth6.Kangkangisaschoolboy.Hegotagoodgiftonhis_______birthday.A.fourteenthB.fortiethC.thefortieth7.Idon’tbelievethatthis_______boycanpaintsuchanicepicture.A.fiveyearsoldB.five-years-oldC.five-year-old8.About_______ofthestudentsinGradeNinethisyearwereborninthe_______.A.threefive;1996B.threefifths;1990sC.thirdfifth;1997D.thirdfifths;1990s9.—Ifa=4,b=5,what’stheanswertothequestion“a+2ab+1=?”—_______.A.Forty-fifthB.Forty-fiveC.Twenty-threeD.Onehundredandtwenty-one10.—Doyouhaveenoughstudentstocleanthelaboratory?—No,Ithinkweneed_______students.A.anotherB.twoothersC.moretwoD.twomore