英语数词用法..

★五、数词一、数词的分类数词分基数词和序数词两类。表示数目多少的数词叫做基数词，如：one,ten,fifteen等；表示顺序先后的数词叫做序数词，如second,fifth,twelfth等。1.基数A．从1—10one，two，three，four，five，six，seven，eight，nine，tenB．从11—19eleven，twelve，thirteen，fourteen，fifteen，sixteen，seventeen，eighteen，nineteen．C．从21—99特殊:twenty，thirty,forty，fifty，sixty,seventy,eighty,ninety21:twenty-one56:fifty-sixD．百位数101onehundredandone178onehundred(and)seventy-eightE．千位数以上thousand千million百万billion十亿4,000：fourthousand2,000,000:twomillion6,000,000,000:sixbillionF.基数词表示确切的数时，不用复数形式.表示不确切数，如成百、成千上万，则用复数。320threehundredandtwentyTherearehundredsofpeopleinthehall．2.序数词A．第一至第十九特殊:first，second，third，fifth，eighth，ninth，twelfth其他:添加“-th”。如sixth、nineteenth．B．从第二十至第九十九变y为i，再加“eth”构成。twenty——twentieththirty——thirtieth☆表示第几十几时，用几十的基数词+“-”+个位序数词。thirty-first第三十一fifty-sixth第五十六seventy-third第七十三ninety-ninth第九十九序数词构成规律口诀基变序,有规律,一二三特殊记，词尾字母t,d,d，加th从4起，(fourth,sixth)八去“t”，九去“e”，“f”来把“ve”替，(fifth,twelfth)单词“ty”作结尾，“ty”变成“tie”，(twentieth,thirtieth,…ninetieth)若是遇到几十几，只变个位就可以。(fifty-fifth)序数词缩写记清楚,数字后跟两字母（first—1stsecond—2ndthird—3rdfourth—4thtwentieth—20thtwenty-third—23rd）.exercise1.写出下列词的序数词形式1.one2.two3.six4.five5.nine6.twelve7.eight8.twenty-onefirstsecondsixthfifthninthtwelftheighthtwenty-first2.写出下列词的基数词形式。1.third2.fourth3.tenth4.twentieth5.nineteenth6.thirty-first_threefourtentwentynineteenthirty-oneexercise3.选择1.Mycousin’sbirthdayisontheofOctober.A.threeB.firstC.thesecondB2.-Whatdateisittoday?-It’sofSeptember.A.26thB.the26thC.twenty-sixB3.Therearedaysinaweek.A.thesevenB.seventhC.theseventhD.sevenDexercise4.Sundayisthedayofaweek.A.oneB.firstC.secondB5.Twenty-eightminus(减)sixis.A.thetwenty-secondB.twenty-twoC.twenty-secondB6.Fourplus(加)istwelve.A.sevenB.eightC.nineB一、时刻表示法1.几点钟5:00读作fiveo’clock2.几点过几分fivepastseven七点过五分halfpastsix六点半aquarterpasteight八点过一刻3.几点差几分tentoeight差十分八点aquartertotwelve差一刻十二点twentytosix差二十分六点数词的用法时间类型表示法例读法整点基数词（+o’clock)1:00﹤30分钟分钟+past+小时2:10=30分钟half+past+小时3:30﹥30分钟（60-分钟）+to+（小时+1）4:40分钟逢15即一刻钟aquarter5:156:45简化法按顺序读基数词7:50oneo’clocktenpasttwohalfpastthreetwentytofiveaquarterpastfiveaquartertosevensevenfifty表示在几点钟用介词at数词的表示法—时间二、加减乘除表示法1.“加”用plus，and或add表示Howmuchistwoplusthree?Itisfive．Twoandthreeisequaltofive．2.“减”用minusHowmuchistenminussix?3.“乘”multiply3X4＝?Howmuchisthreetimesfour?4.“除”用divide的过去分词形式表示16÷4=?Howmuchissixteendividedbyfour?三、分数表示法1.基数词作分子，序数词作分母，除了分子是“1”，其它情况下序数词都要用复数形式2.当分数后面接名词时，如果分数表示的值大于1，名词用复数；小于1，名词用单数。11/2hours一个半小时（读作oneandahalfhours）四、百分数表示法百分数用基数＋percent50％fiftypercent百分之五十percent不用复数形式。15分子基数词分母序数词onefifth27分子﹥1分母+stwosevenths14分子a分母quarteraquarter34threequarters12ahalf13threeandonethird3基数词+and+分数数词的表示法—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3.78threepointseveneight一般编码用名词+基数词207房三年级一班第五部分第一课3号汽车第一中学Room207ClassoneGradethreepartfive=thefifthpartlessonone=thefirstlessonBusNo.3=theNo.3busNo.1MiddleSchool五、编号一、选择填空。1．Marchis____monthofayear．A．athreeB．thethirdC．athird2．Wewillhaveameetingat8:05____．A．fivetoeightB．eightfiveC．eightfifth3．Eightpluseightis____.A．sixteenB．sixty-fourC．one4．Heisan____boy．A．eightyearsB．eight-year-oldC．eight-years-old5．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．MarcheighthC．eight，March8．Ithappenedinthe1040's．A．inthefortiesoftheeleventhcentury．B．inthefortiesofthetenthcentury．C．intheforty9．About_____________oftheearth\'ssurfaceiscoveredwithwater.A.three-foursB.three-fourthC.three-fourthsA．fourmeterslongB．MarcheighthA．inthefortiesoftheeleventhcentury．C.three-fourths10.Hewentdowntothevillagewhichwas___milesawayfromthecity.A.threehundredsB.threehundredC.threehundredsofB.threehundred