数词复习数词的构成基数词序数词1－12有各自独立的形式。13-19都是相对应3－9加上teen构成，特殊拼写的词有thirteen,fifteen,eighteen。20－90都以-ty结尾，特殊拼写的有twenty,thirty,forty,eighty。21－99,整数十位数＋各位数，中间有“－”。百位数，由百位数＋and+两位数组成。……1－3分别为first,second,third。4－19都是在后面加上th,特殊的有fifth,eighth,ninth,twelfth。20－90把y变成ie然后加th,如twentieth。21－99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：severalhundred2.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：inthe1920s3.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.inthefirstplace5.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,Room3047.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…)of…Theearthis49timesthesizeofthemoon.地球是月球的49倍。c.倍数（分数）+形容词（副词）比较级+than…Thegrainoutputis8percenthigherthisyearthanthatoflastyear.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：1．Itisfewminutesbeforesixo'clock．现在是六点差几分。2．Thecorrecttimeisthreeminutesafterten．准确时间是十点三分。3．Ithappenedataquarterbeforefive．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:1.Isthereanyfoodforus____?A.tenB.tenthC.thetenthD.theten2.Thebikecostme________yuan.A．fivehundredfortyB．fivehundredsfourtyC．fivehundredandfortyD．fivehundredfourty3.“Whichlessonareyoustudyingnow?”--“________”．A.ThelessonsixB.SixthlessonC.LessonsixD.Lessonsixth4.Thehaswrittena____composition．A．three-hundred-wordB．threehundredwordsC．threehundredswordsD．threehundredsword5.Shewasbornon________．A．1986,March9B．March9,1986C．1986,9MarchD．Marchnine,1986ACCAB1.Wehavefinishedreading____units.A．thefirsttwoB．firsttwoC．thesecondD．twofirst2.Mytelephonenumberis____．A．eightyeighttwofortyfourzeronineB．eighteighttwodoublefourOnineC．eightyeighttwofourfourzeronineD．eighteighttwofourfourzeroandnine3.Everydaytheoldwomansitsherefor____.A.oneandhalfhourB.oneandahalfhourC.oneandhalfhoursD.oneandahalfhours4.MrGreenWillhave____holidayverysoon.A.twomonthsB.twomonthC.atwo-monthsD.atwo-month5.Maryis____girl.A.an8yearoldB.8-years-oldC.the8yearsoldD.an8-year-oldABDDD1.--Whatdayistoday?----_____.--A.June9.B.TuesdayC.Itishot.D.It'sfine.2.Thatmagnificent____pyramidwasbuiltbytheEgyptianpeople.A.nine-centuries-oldB.nine-century's-oldC.ninecenturyoldD.nine-century-old3.--What'sthedatetoday?----____--.A.It'sSaturdayB.It'sJulyC.It'sfineD.It'sJuly154.--Whattimedoyougetupeveryday?----____--.A.It'sseveno'clockB.Seveno'clocktimeC.AtsevenD.OnsevenBDDC
