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1、数词Numerals表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。什么叫数词?21基数词（cardinalnumber）1onetwothree4four5five6six7seven8eight9nine10ten111213141516171819eleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteen2030405060708090100twentythirtyfortyfiftysixtyseventyeightyninetyoneh
2、undred基数词的构成1）1－12,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13--19,由3－9+teen构成。14–fourteen16--sixteen17--seventeen19—nineteen特殊拼写:13–thirteen15--fifteen18—eighteen3）20－90,以-ty结尾。20—twenty30---thirty40—forty50—fifty60---sixty70---seventy80---eighty90—ninety4）21－99，两位数，十位与个位之间有“
3、-”。21twenty-one55fifty-five99ninety-nine5）101—999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three5297hundredand基数词三位数的构成6twenty-nine729hundredandseven035hundredand再来一个7three503hundredandfive基数词三位数的构成8hundredand百位数十/个位数fourhundredandthirty-twoonehundred
4、andseventyeighthundredandsixty-fiveonehundredandnine109432170865作业339126203451704178926854703151309326703651307428注：1、1000以上几个的词，每三位数加一个逗号，第一个逗号前的数为thousand，第二个逗号前的数为million（百万）,第三个逗号前的数为billion（十亿），第四个逗号前的数为trillion（万亿）888,888，888，888，888eighthundredandeighty-eighttrillion,eighthundredandeigh
5、ty-eightbillion,eighthundredandeighty-eightmillion,eighthundredandeighty-eightthousand,eighthundredandeighty-eighttrillion[ˈtrɪljən]万亿billion[ˈbɪljən]十亿million[ˈmɪljən]百万thousand['θaʊznd]千hundred[ˈhʌndrəd]百29,43150076,,thousand,hundredmillion,billion,and6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,m
6、illion,billion千百万十亿基数词的构成12基数词的构成6500431729sixbillion,fivehundredmillion,fourhundredandthirty-onethousand,sevenhundredandtwenty-ninefourthousand,threehundredandtwenty-onesevenmillion,sixhundredandfiftyfourthousand,threehundredandtwenty-one7,654,3211,987,654,32143214,321onebillion,ninehundredan
7、deighty-sevenmillion,sixhundredandfifty-fourthousand,threehundredandtwenty-one1.hundredthousand(表示具体数字)millionbillion2.hundredsthousands(表示概数)millionsbillions三.基数词的用法数词(several)++ofthe/some/many/these/thosehundredsof基数词的用法1、表示具体数目,hundr
