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专题（四）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第一到第十第十一到第十九第二十以上first-1steleventh-11thtwentieth-20thsecond-2ndtwelfth-12ththirtieth-30ththird-3rdthirteenth-13thfortieth-40thfourth-4thfourteenth-14thfiftieth-50thfifth-5thfifteenth-15thsixtieth-60thsixth-6thsixteenth-16thseventieth-70thseventh-7thseventeenth-17theightieth-80theighth-8theighteenth-18thninetieth-90thninth-9thnineteenth-19thhundredth-100thtenth-10ththousandth-1000th【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?对接中考专练语法综合演练用所给词的适当形式填空。1.[2019·河北改编]IgottoknowDavidonthe(two)dayofmiddleschool.2.[2018·河北改编]Laterinthe(three)class,Mr.Ducameinandaskedmetogotothefront.3.[2017·河北改编]MyfriendSamisinthe(ten)grade.4.[2019·唐山路南区一模改编]Attheendofeverygrowingseason,(thousand)ofpotatoesweredugoutoftheground,andreadyforthemarket.secondthirdtenththousands对接中考专练语法综合演练5.[2019·唐山路北区一模改编]Iworkedhardbecausethatwasmy______(one)part-timejobanditisimportanttome.6.[2018·龙东]Iwanttoinvitesomeofmyfriendstomy__________(twenty)birthdayparty.7.[2018·兰州]Asweallknow,Teachers'Dayisinthe(nine)monthoftheyear.Itisthebesttimeforustoshowourloveandrespecttothem.firsttwentiethninth对接中考专练语法综合演练8.[2018·安顺]Decemberisthe(twelve)monthofayear.9.[2018·泰州]Allthefamilymembersarebusygettingreadyformyfather's(forty)birthdayparty.10.[2018·云南]FootballWorldCupisbeingheldinRussianow.Itisthe(twenty-one)FootballWorldCup.twelfthfortiethtwenty-first