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1、江苏省盐城东台市唐洋镇英语二轮复习数词学案【学习目标】1.掌握数词的含义2.掌握数词在各种语境中正确应用【重点难点】1,基数词与序数词的概念2,基数词如何转换成序数词3,如何在各种语境中正确应用数词【预习指导】一,什么是基数词?(表示人或事物数目的词叫基数词。)n基数词的构成1-12的数,这些数词在中考中出现的频率较高,需要识记1→one2→two3→three4→four5→five6→six7→seven8→eight9→nine10→ten11→eleven12→twelve13-19的词(这些词要注意观察,根据规律teen记忆)13→thirteen14→fourt
2、een15→fifteen16→sixteen17→seventeen18→eighteen19→nineteen20-90整十的数这些词要根据规律ty记忆,中考中出现频率较高的是twenty,forty,fifty,ninety20→twenty30→thirty40→forty50→fifty60→sixty70→seventy80→eighty90→ninety100→onehundred几十几的两位数(由整十的数加“-”加1-9的个位数21→twenty-one34→thirty-four36→thirty-six48→forty-eight53→fifty-thr
3、ee67→sixty-seven72→seventy-two75→seventy-five85→eighty-five88→eighty-eight98→ninety-eight99→ninety-nine三位数(百位后加hundred,百位和十位之间用and连接,十位和个位之间用几十几的读法和写法)125→onehundredandtwenty-five368→threehundredandsixty-eight450→fourhundredandfifty888→eighthundredandeighty-eight999→ninehundredandninety-ni
4、ne108→onehundredandeight509→fivehundredandninen百hundred,千thousand,百万million,十亿billionn四位数或四位以上的数,先从右往左数,每三位用“,”隔开,第一个“,”表示thousand,第二个“,”表示million,第三个“,”表示billion,逗号与逗号之间用几百几十几的表达方法。33333333333→33,333,333,333thirty-threebillion,threehundredandthirty-threemilliom,threehundredandthirty-three
5、thousand,threehundredandthirty-three570208944059→570,208,944,059fivehundredandseventybillion,twohundredandeightmilliom,ninehundredandforty-fourthousand,andfifty-ninen表示具体,准确的数时,hundred,thousand,milliom,billion等词后面不能加”s”,如:fivehundredstudents,ninethousandpeople,twomillionn当表示不具体,不准确的数时,加“s”
6、,与”of”连用。如:hundredsofstudents,milliomsoftrees二,什么是序数词?n表示人或事物顺序的词叫序数词。one→firsttwo→secondthree→thirdfour→fourth3用心爱心专心five→fifthsix→sixtheight→eighthnine→ninthtwelve→twelfththirteen→thirteenthfourteen→fourteentheighteen→eighteenthnineteen→nineteenthtwenty→twentietheighty→eightiethninety→ni
7、netiethonehundred→onehundredth如何将基数词转换成序数词?(口诀)n基变序,有规律n末尾加上“th”four---fourthn一二三,特殊记firstsecondthirdn“ve”要用“f”替five---fifthtwelve---twelfthn八去“t”,九去“e”eight---eighthnine---ninthn末尾“y”变“ie”twenty---twentiethn如果遇到几十几n只变末位就可以thiety-one----thirty-firsteighty-five