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专题（三）数词考点一基数词1.基数词的基本形式(1)1—12独立成词,需逐个记忆。(2)13—19的基数词以-teen结尾。尤其要注意thirteen,fifteen,eighteen的正确拼写。(3)表示“整十”的基数词(20—90)都以-ty结尾。其中要特别注意twenty,thirty,forty,fifty,eighty,ninety的正确拼写。(4)hundred,thousand,million,billion等词前有具体数字时,不能加-s,也不与of连用;无具体数字时,要加-s,且与of连用。2.基数词的其他表达形式(1)21—99的写法是在十位和个位中间加连字符号“-”。36—thirty-six97—ninety-seven(2)101—999的构成是百位和十位之间(若十位为零,则在百位和个位之间)用and连接。601—sixhundredandone755—sevenhundredandfifty-five(3)四位数或者四位数以上的基数词的拼写规律：从右往左每三位加一个逗号,第一个逗号读作thousand(千),第二个逗号读作million(百万),第三个逗号读作billion(十亿)。94,295—ninety-fourthousandtwohundredandninety-five(4)“基数词-单数名词”相当于复合形容词,只能作定语,用于表示时间、距离等。aten-minutewalk步行10分钟的路程(5)“基数词+more”与“another+基数词”意义相同,表示“再……;另外……”。twomoredays=anothertwodays另外两天考点二序数词构成说明例词规则变化大多数序数词由“基数词+-th”构成four—fourth以y结尾的整十基数词变序数词,要变y为ie,再加-ththirty—thirtiethfifty—fiftieth20以上的非整十基数词变序数词,要将末位数改成序数词,其他位数仍用基数词thirty-one—thirty-first不规则变化少数序数词的构成属于特殊情况,需要特殊记忆one—firsttwo—secondthree—thirdfive—fiftheight—eighthnine—ninthtwelve—twelfth【巧学妙记】基变序,有规律,词尾加上-th;一、二、三,特殊记,结尾字母t,d,d(first,second,third);8去t(eighth),9去e(ninth),ve要用f替(fifth,twelfth);遇y变ie,然后再加-th;遇到“几十几”,只变个位就可以。考点三数词的表达方式March12,20202020年3月12日onethird三分之一twothirds三分之二five(o'clock)5点钟fivepastseven7点5分twentytoeight7点40分Page62/thesixty-secondpage第62页inthe1970s在20世纪70年代inhisforties在他四十多岁时考点四数词的注意事项1.hundred,thousand,million前有基数词修饰时,表示确数,其后不加“-s”,也不与of连用;但表示“数百、数千、数百万”这样的概数时,后面加“-s”,并与of连用。Therearetwohundredpeopleinthehall.大厅里有200人。Thousandsofpeoplegotothebeacheveryyear.每年有成千上万的人到海滩去。Millionsofpeopleintheworldaresendingandreceivinge-mailseveryday.每天世界上有数百万人在收发邮件。2.序数词在使用时,通常前面要加定冠词the;但如果序数词前出现不定冠词a或an,则表示“再一;又一”;当序数词前有物主代词时,不需加the。We'vetriedittwice.Mustwetryitathirdtime?我们已经试过两次了。我们必须再试一次(第三次)吗?3.以下复合形容词中的名词要用单数形式。(1)基数词-名词(单数)two-hourdrive两小时的车程(2)基数词-名词(单数)-形容词an8-year-oldboy一个8岁的男孩Ⅰ.选择填空1.Morethantwotreesareplantedinourneighbourhoodeveryyear.A.hundredB.hundredsC.hundredsofD.hundredof2.Kobe'sfanswatchedhisfinalmatchandofthemweremen.A.Threemillions;fourthfiveB.Millionsof;fourfifthsC.Millionof;fourfifthsD.Threemillion;fourthfifths对接中考专练语法专题训练AB3.—Howoldisyoursister?—.WehadaspecialpartyforherbirthdaylastSunday.A.Nine;nineB.Nine;ninthC.Ninth;nineD.Ninth;ninth4.Eachofushastowriteareporteveryweek.A.two-hundred-wordB.two-hundreds-wordC.two-hundreds-wordsD.two-hundred-words5.Morethanofthechildrentookpartintheactivitieslastweek.A.twothirdsB.thirdssecondC.secondthreeD.twothird对接中考专练语法专题训练BAAⅡ.根根据句子意思,用括号中所给单词的正确形式填空。1.[2019·徐州]HowhappyIamtocelebratemy(fifteen)birthdaytomorrow!2.[2014·徐州]Janewouldliketoliveonthe(three)floor.3.[2019·徐州二模]Lastweek,theGreensheldapartytocelebratetheirmother's(sixty)birthday.4.[2019·徐州质检]Theyoungcoupleplantohavea(two)babyinthefollowingyear.5.[2018·徐州一模]In2020,thePalaceMuseum,whichwascompletedin1620,willcelebrateitsfour(hundred)birthday.对接中考专练语法专题训练fifteenththirdsixtiethsecondhundredth6.Decemberisthe(twelve)monthofayear.7.Three(four)ofthestudentsinourclasslikebasketball.8.Petergotamodelshipfromhisuncleonhis(ten)birthday.9.Inthe(eight)picture,youcanseemanyyoungtrees.10.Theladybecameveryfamousinher(forty).11.Yesterdayherbrotherhadhis(twenty)birthdayathome.12.Peopleworkedhardtocarryouttheeconomicobjectives(经济目标)ofChina's(thirteen)Five-YearPlan.对接中考专练语法专题训练twelfthfourthstentheighthfortiestwentieththirteenth13.Mayisaperfecttimetohaveanouting.Atthistimeeveryyear,(thousand)ofpeoplewillhaveaself-drivingtravel.14.Thisisthe(six)timeforourschooltoholdtherobot-makingcontest.对接中考专练语法专题训练thousandssixth