基数词和序数词

基数词和序数词一．表示数目多少的词叫基数词：100以下的基本基数词100以上1-1011-1920-90100a/onehundred;1000a/onethousand;1,000,000a/onemillion;1,000,000,000a/onebillion（美）a/onethousandmillion(英)1one11eleven20twenty2two12twelve30thirty3three13thirteen40forty4four14fourteen50fifty5five15fifteen60sixty6six16sixteen70seventy7seven17seventeen80eighty8eight18eightteen90ninety9nine19nineteen10ten二．表示顺序的数次叫序数词：基本序数词的构成1stfirst11theleventh20thtwentieth30ththirtieth2ndsecond12thtwelfth21sttwenty-first40thfortieth3rdthird13ththirteenth22ndtwenty-second50thfiftieth4thfourth14thfourteenth23rdtwenty-third60thsixtieth5thfifth15thfifteenth24thtwenty-fourth70thsevenyieth6thsixth16thsixteenth25thtwenty-fifth80theightieth7thseventh17thseventeenth26thtwenty-sixth90thninetieth8theighth18theighteenth27thtwenty-seventh100thonehundredth9thninth19thnineteenth28thtwenty-eighty1,000thonethousangth10thtenth29thtwenty-ninth1,,000,000thonemillionth100,000,000thonebillionth注意：Hundredthousandmillion1.其前有具体数字时，用单数：Therearethousandstudentsinthisinthisschool.这所学校大约有2000名学生。2.前无数词，模糊数字+s+of短语:Hundredsofpeoplecometoseeourplay.It’ssogreat.成百的人来看我们的戏剧，它太成功了。3.基数词变序数词口诀：基变序，很容易，结尾加上th。一二三特殊记，结尾各是t,d,d。八去t,九去e,f来把ve替，y改为ie,结尾仍有th。若是遇到几十几，只变个位就可以。三．基数词的用法：1.基数词在句中可用作主语、宾语、表语、定语和同位语。主语：Fourofthemwenttothefactory.他们四个人去了工厂。宾语：Iwanttwo.我要两个。定语：Therethirtyclassroomsinourschool.我们学校有30个教室。表语：Myclassmateiseighteen.我的同学18岁。Heisonlythree,andhecan’tdresshimself.他只有三岁，不会穿衣服。同位语：Wethreewillgotheretogether.我们3个一起去。注意：1以上的基数词作定语时，它所修饰的名词要用复数形式：Theroadis16metersinwidth.这条路十六米宽。18Americanstudentscametoourschoolyesterday.昨天有18个美国学生来到我校。四．序数词的用法：1.序数词可以在句子中当主语、宾语、定语、表语。主语：ThesecondiswhatIreallyneed.第二个是是我真正需要的。宾语：Hechosethesecond.他选了第二个。定语：Wearecarryoutthefirstplan.我们将执行第一个计划。表语：Sheisthesecondinourclass.在我们班她是第二名。注意：1.TheninestudentsareinClassFive.这九个学生都是五班的。2.TheninthstudentisinClassFive.第九个学生是五班的。3.序数词前用不定冠词的常见情况：①序数词前加“a”表“再一次”。MayIhaveasecondtry?我能再试一次吗？Nowtellmewhyyoutookasecondarrow.告诉我，为什么你手里拿着另一支箭？②在名次中排“第几”Youshouldtrytogetafirstorasecondintheexamination.你应力争在这次考试中得个第一、二名。③表示任何一个“第几者”。Wedon’tallowathirdtohaveahandinthismatter.我们不允许第三者插手此事。④当“分数词”用表示“几分之几”。Athirdofthestudentsfailedintheexam.三分之一的学生在这次考试中没及格。五．时间表达法：1.顺序法sevenfive7:05sevenfifty-two7:52seventhirty7：302.先分钟后时刻法：整点用o’clock,半点用half.＞30用to，＜30用past.15和45分钟用quarter(0.2515分钟)8o’clock八点halfpasteighta.m.上午八点半aquartertotwelve差一刻12点twenty-ninetoeight差29分八点twenty-ninepasteight8:29六．数词的固定搭配：inone合为一体oneandthesame同一个ononehand一方面bytwos成双成对intwo一分为二secondtonone首屈一指five-star一流的；五星的atsixesandsevens乱七八糟tentoone十分之九ahundredandone许多intwosandthrees三三两两；稀稀拉拉Ittakestwotodosomething双方均有责任。Twoheadsarebetterthanone三个臭皮匠，顶个诸葛亮七．年、月、日的顺序：①日、月、年5Jane2005②月、日、年Jane52005inthe1990’s(nineteennineties)20世纪90年代724B.C.=sevenfourtwoB.C.公元前724年2000A.D.公元2000年八．年龄表达法：一个十七岁的女孩a17-year-oldgirlagirl17yearsoldagirlof17agirlaged17其他：416房间：Room4161路公共汽车：Bus1幸福大街81号：No.81,Xingfustreet电话号码256-9905：Tel.No.twofivesixninenine(两个9也可表示为：doublenine)0(零)five邮政编号100056;Postcode/Zipcodeone0(零)00fivesix5.078:fivepointzeroseveneight1/3:one-third3/5:three-fifths8%:eightpercentPage120第120页倍数表达法：三次以上用“基数词+times”，两倍用twice或double。Theearthis49timesthesizeofthemoon.地球是月球的四十九倍。算式加减乘除表示法：加、乘算式中，谓语动词即可用单数也可用复数，但减、除算式中，谓语动词只能用单数。5+6=11fiveand/plussixis/are/makes/make/equal/equalseleven.25×4=100Twenty-fivetimes(multiplies)fourareonehundred.12－7=5Twelveminussevenequalsfive.16÷4=4Sixteendividedbyfourisfour.一加一等于几？Howmuchisoneplusone?It’stwo.Holdonmyown坚持住。Goldspeedmylove.上上帝助我突破层层障碍。2011年9月8日星期四9:40邓翰生于家中