《中考复习新导引英语》课件专题3 数词

专题3中考新导引复习讲义数词1基数词变序数词数词分为基数词和序数词。基数词表示数目的多少，序数词表示事物的先后顺序。基数数变为序数时，一般在词尾加th,但有特殊情况。(1)不规则变化，如：one–first,two–second,three–third,five–fifth,eight–eighth,nine–ninth,twelve–twelfth(2)以ty结尾的词，要先变y为i,再加-eth，如：twenty–twentieth,forty–fortieth,ninety–ninetieth(3)多位数词，要将末尾的单词变为序数词，如：thirty-four–thirty-fourth,fifty-one–fifty-first2数词的用法(1)在谈编了号的东西时，可以用基数词或序数词表示顺序，如：thefirstpart=partonetheSecondLesson=LessonTwo但如果数字较长，应避免使用序数词，如：Room405,Page781,BusNo.202(2)日期可以用基数词或序数词表示，写法有多种，如：March10,March10th,Marchthe10th,10March,10thMarch,10thofMarch(3)时刻的读法①顺读法，也叫直接读法，先读“小时数”，再读“分钟数”，见数读出，如：5:15fivefifteen9:30ninethirty10:40tenforty

20:25twentytwenty-five22:00twenty-two(o’clock)2数词的用法②倒读法，先读“分钟数”，再读“小时数”使用此方法要注意，如果所表述的分钟数在30以内，用“分钟数+past+小时数”来表示，介词past的意思是“过”；如果所表示的分钟数超过30，用“（60-分钟数）+to+(小时数+1)”来表示，介词to的意思是“差”；如果分钟数恰好为30，用“half+past+小时数”来表示；如果所表述的分钟数与15有关，用“fifteen/aquarter+past/to+小时数/小时数+1”来表示，如：

5:15aquarter/fifteenpastfive8:25twenty-fivepasteight

9:30halfpastnine10:40twentytoeleven

11:45aquarter/fifteentotwelve1:58twototwo

20:25twenty-fivepasttwenty2数词的用法(4)序数词往往与定冠词the连用，如：

Todaywearegoingtolearnthesecondlesson.

但有时可加不定冠词a/an,表示“再一，又一”，如：

It’sveryimportanttolearnasecondlanguage.He’sgettingmarriedathirdtime.(5)hundred,thousand,million用于表达确定数目时，不用复数形式，如：sixhundredpeople,twothousandpounds,tenmillionpeople

但当这些词用于表达粗略估计的数目时，必须用复数形式，如：hundredsofworkers,thousandsofpeople,millionsofbirds写出下列时间的两种读法精练51.6:12_____________________________

2.7:15_____________________________3.8:30_____________________________4.9:35_____________________________5.5:45_____________________________

6.13:50_____________________________sixtwelvetwelvepastsixsevenfifteenaquarter(fifteen)

pastseveneightthirtyhalfpasteightninethirty-fivetwenty-fivetotenfiveforty-fiveaquarter(fifteen)tosixthirteenfiftytentofourteen用所给数词的适当形式填空精练61.Sundayisthe___________（one）dayofaweek.2.Thereare___________(four)seasonsinayear.3.Igotalotofpresentsonmy___________(nine)birthday.4.Decemberisthe___________(twelve)monthofayear.5.Pleaseturntopage___________(seven)andlookatthe___________(three)picture.6.Technologyisdevelopingsoquicklyinthe___________(twenty-one)century.firstfourtwelfthseventwenty-firstninththird用所给数词的适当形式填空精练67.Myuncleandauntliveonthe___________(thirty)floor.8.Theriverisabout___________(fifteen)meterswide.9.Aroundthree___________(hundred)peoplewerehurtintheaccident.10.Thestoryhappenednearlytwo___________(thousand)yearsago.11.___________(million)oftourist