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1、数词1.基数词构成方法举例（1）1-12的基数词是独立的，需牢记1(one),2(two),3(three),4(four),5(five),6(six),7(seven),8(eight),9(nine),10(ten),11(eleven),12(twelve)（2)13-19的基数词以-teen结尾13(thirteen),15(fifteen),18(eighteen)(3)20-29的整十数以-ty结尾20(twenty),30(thirty),40(forty),50(fifty)(4)十位数与个位数之间要加连字符“-”53(fifty-three),76(
2、seventy-six)(5)百位和十位（若无十位则和个位）之间加and892（eighthundredandninety-two)(6)hundred（百），thousand（千），million（百万），billion（十亿）等前面有具体数词时，不能在他们的后面加“s”,但这几个数字单位与of连用时，要用复数形式。800（eighthunderd),3,000(threethousand),hundredsof成百上千，thousandsof成千上万，millionsof数百万计(7)四位数以上的数要用科学计数法，从后往前数，每三位数加“s”,第二个逗号为百万（mi
3、llion），第三个逗号为十亿（billion）。3,999（threethousandninehundredandninety-nine)注意：英语中没有表示“万”的单词，要用“几十个千”来表示万，“几百个千”来表示几十万，如：10,000（tenthousand),30万（threehundredthousand)。Excercise:1.I’m13yearsoldandmysisteris15yearsold.Somysisteris_______yearsolderthanme.A.oneB.twoC.threeD.four2.Everyyear,______p
4、eoplegotovisittheirfactory.A.athousandofB.thousandsC.thousandofD.thousandsof3.Youcansee_______ifyougooutatnight.A.millionstarsB.thousandofstarsC.hundredsstarsD.millionsofstars4.I’dlike____bowlofnoodles.Oneisformyselfandtheothertwoareformyparents.A.oneB.twoC.threeD.four5.Eachofushastowrit
5、ea__________reporteverytwoweeks.A.two-hundred-wordB.two-hundreds-wordC.two-hundreds-wordsD.two-hundred-words2.序数词基数词变序数词规律举例（1）一二三，特殊记one-first,two-second,three-third（2）八加h,九去e,ve要用f替,以y结尾变ie，后跟th莫忘记eight-eighth,nine-ninth,five-fifth,twelve-twelfth,twenty-twentieth,thirty-thirtieth,forty
6、-fortieth（3）若是遇到几十几，只变个位就可以twenty-six---twenty-sixth,fifty-one---fifty-first（4）其他情况six-sixth,eighteen-eighteenth,hundred-hundredthExcercise:1.---Mum,Igot_______placeintheEnglishSpeechCompetition.]---__________!That’sreallygoodnews,dear!A.thefist;Congratulations!B.first;I’msorrytohearthat
7、C.thefirst;Congratulations!D.first;Wahtapity!2.ThreestudentsranfasterthanLilyintherace.Lilywas_________.A.thefourthB.fourC.thethird3.Tomanyforeigners,Guangzhouhasbecometheir______hometown.A.twoB.secondC.thesecond4.---Doyouknowtheboy______issittingnexttoPeter?---Yes.He’sPe
