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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March12,20182018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?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.5.[2019·唐山路北区一模改编]Iworkedhardbecausethatwasmy（one）part-timejobanditisimportanttome.对接中考专练secondthirdtenththousandsfirst6.[2018·龙东]Iwanttoinvitesomeofmyfriendstomy（twenty）birthdayparty.7.[2018·兰州]Asweallknow,Teachers'Dayisinthe（nine）monthoftheyear.Itisthebesttimeforustoshowourloveandrespecttothem.8.[2018·安顺]Decemberisthe（twelve）monthofayear.9.[2018·泰州]Allthefamilymembersarebusygettingreadyformyfather's（forty）birthdayparty.10.[2018·云南]FootballWorldCupisbeingheldinRussianow.Itisthe（twenty-one）FootballWorldCup.对接中考专练twentiethninthtwelfthfortiethtwenty-first