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数词复习,数词的构成,基数词序数词,112有各自独立的形式。13-19都是相对应39加上teen构成，特殊拼写的词有thirteen,fifteen,eighteen。2090都以-ty结尾，特殊拼写的有twenty,thirty,forty,eighty。2199,整数十位数各位数，中间有“”。百位数，由百位数and+两位数组成。,13分别为first,second,third。419都是在后面加上th,特殊的有fifth,eighth,ninth,twelfth。2090把y变成ie然后加th,如twentieth。2199的序数词变后面的各位数。序数词可以用缩写，如1st,2nd,3rd,4th,基本用法：,1.基数词：表示精确数字时，hundred,thousand,million,billion后面都不用变化。但是在表示几百，几千等模糊概念时，这些词后面要加上s和of,如：hundredsof,而且前面可以加上many,tensof等表示不确切的词，注意several,some是表示确切数字的词：severalhundred,2.数词一般是用作复数的，但是特殊情况也有复数的用法：a.在表示一排或者一组的情况下：Theyarrivedintwosandthrees.b.表示几十岁：theforties-41-49c.表示年代：inthe1920s,3.基数词兼有名词和形容词的功能：NineofthemarefromGreece.Theyworkfortyhoursaday.,4.序数词主要用作定语。一般要加the.Ourclassroomisonthethirdfloor.Thefirstpartofthestoryisnotinteresting.inthefirstplace,5.序数词也可以用作副词，Whendidyoufirstseehim?Whichhorsecameinfirst?,6.基数词也能表示顺序，如书刊的卷、章、节、页的数目，住所、房间、教室、电话号码等等。VolumeTwo,ChapterFour,SectionSix,PageEight,Room304,7.倍数的表示法a.倍数（或分数）+as+adj.+asIhavethreetimesasmanyasyou.我有你三倍那么多。b.倍数（分数）+thesize(amount，length)ofTheearthis49timesthesizeofthemoon.地球是月球的49倍。c.倍数（分数）+形容词（副词）比较级+thanThegrainoutputis8percenthigherthisyearthanthatoflastyear.今年比去年粮食产量增加8%。d.还可以用by+倍数，表示增加多少倍Theproductionofgrainhasbeenincreasedbyfourtimesthisyear.今年粮食产量增加了4倍。,8.日期，时间和分数的表示法见书本p20。,9.也可以用after和before表示时间，情况分别与past和to相当。如：1Itisfewminutesbeforesixoclock现在是六点差几分。2Thecorrecttimeisthreeminutesafterten准确时间是十点三分。3Ithappenedataquarterbeforefive事情发生在五点差一刻的时候。,10.序数词前面一般要加the,但是也有不加的情况，这个时候表示“又一，再一”的意思。Theyhadasecondchildin1988.上面的asecond可以用another代替。,Exercises:Isthereanyfoodforus_?A.tenB.tenthC.thetenthD.thetenThebikecostme_yuan.AfivehundredfortyBfivehundredsfourtyCfivehundredandfortyDfivehundredfourty“Whichlessonareyoustudyingnow?”-“_”A.ThelessonsixB.SixthlessonC.LessonsixD.LessonsixthThehaswrittena_compositionAthree-hundred-wordBthreehundredwordsCthreehundredswordsDthreehundredswordShewasbornon_A1986,March9BMarch9,1986C1986,9MarchDMarchnine,1986,A,C,C,A,B,Wehavefinishedreading_units.AthefirsttwoBfirsttwoCthesecondDtwofirstMytelephonenumberis_AeightyeighttwofortyfourzeronineBeighteighttwodoublefourOnineCeightyeighttwofourfourzeronineDeighteighttwofourfourzeroandnineEverydaytheoldwomansitsherefor_.A.oneandhalfhourB.oneandahalfhourC.oneandhalfhoursD.oneandahalfhoursMrGreenWillhave_holidayverysoon.A.twomonthsB.twomonthC.atwo-monthsD.atwo-monthMaryis_girl.A.an8yearoldB.8-years-oldC.the8yearsoldD.an8-year-old,A,B,D,D,D,-Whatdayistoday?-_.-A.June9.B.TuesdayC.Itishot.D.Itsfine.Thatmagnificent_pyramidwasbuiltbytheEgyptianpeople.A.nine-centuries-oldB.nine-centurys-oldC.ninecenturyoldD.nine-century-old-Whatsthedatetoday?-_-.A.ItsSaturdayB.ItsJulyC.ItsfineD.ItsJuly15-Whattimedoyougetupeveryday?-_-.A.ItssevenoclockB.SevenoclocktimeC.AtsevenD.Onseven,B,D,D,C,
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