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数词定义:表示数目多少或顺序次第的词叫作数词。数词包括基数词和序数词两种一、基数词1至12的基数词是独立的词：onetwothreefourfivesixseveneightnineteneleventwelveA、13至19的基

数词以后缀-teen结尾：thirteenfourteenfifteensixteenseventeeneighteennineteen20至90的整十位数的词以后缀-ty结尾：twentythirtyfort

yfiftysixtyseventyeightyninety几十几的基数词由十位数的词和个位数的词合成，中间加连字符“-”eg:34thirty-four42forty-two三位数的基数词须在百位和十位（若无十位则和个位）之间加andeg:158onehundredandfifty-eigh

t四位数即1，000以上的基数词，从后往前数，每三位加一个逗号“，”第一个逗号前为千thousand,第二个逗号前为百万million,第三个逗号前为十亿billioneg:6,364,285,751sixbillion,threehundredandsixty-

fourmillion,twohundredandeighty-fivethousand,sevenhundredandfiftyone二、序数词第1到第3:firstsecondthird第4到第19的序数词以后缀-th结尾：fourth

fifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth第20到第90的十位数序数词变-y为-i再加eth

:twentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetieth整单位数的序数词直接加th:hundredththousandthmilliont

hbillionth其余的序数词的构成为：基数词+序数词eg:132ndonehundredandthirty-second三、小数表达法eg:3.26threepointtwosix四、分数表达法eg:1/5onefifth2/5twofifth

s1/5oneinfive或oneoutoffive五、百分数表达法eg:45%forty-fivepercent六、倍数表达法A、Ais+倍数as+adj./adv.原级(many/much+n.)+as+Beg:L

ineAisthreetimesaslongaslineB.(AustraliahasfourteentimesasmanypeopleasAmerica.)B、Ais+倍数+adj./adv.比较级+thanBeg:LineAistwice

longerthanlineB.C、Ais+倍数+the+相应n.(height/width/length/size)+of+Beg:LineAisthreetimesthelengthoflineB.D、Ais+倍数+that/thos

e+ofBeg:Tom’sageistwicethatofJim’s.七、编号顺序的表达eg:第一课Lessonone着重编号theFirstLesson着重顺序数词定义:表示数目多少或顺序次第的词叫作数词

。数词包括基数词和序数词两种八、基数词1至12的基数词是独立的词：onetwothreefourfivesixseveneightnineteneleventwelveA、13至19的基数词以后缀-teen结尾：thirteenfourteenfifteensixteenseventeeneigh

teennineteen20至90的整十位数的词以后缀-ty结尾：twentythirtyfortyfiftysixtyseventyeightyninety几十几的基数词由十位数的词和个位数的词合成，中间加连字符“-”eg:34thirty-four42forty-t

wo三位数的基数词须在百位和十位（若无十位则和个位）之间加andeg:158onehundredandfifty-eight四位数即1，000以上的基数词，从后往前数，每三位加一个逗号“，”第一个逗号前为千thousand,第二个逗号前为百万million,第三个逗号前为十亿billion

eg:6,364,285,751sixbillion,threehundredandsixty-fourmillion,twohundredandeighty-fivethousand,sevenhundredandfiftyone九、序数词第1到第3:fir

stsecondthird第4到第19的序数词以后缀-th结尾：fourthfifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheig

hteenthnineteenth第20到第90的十位数序数词变-y为-i再加eth:twentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetieth整单位数的序数词直接加th:hundredthth

ousandthmillionthbillionth其余的序数词的构成为：基数词+序数词eg:132ndonehundredandthirty-second十、小数表达法eg:3.26threepointtwosix十一、分数表达法eg:1/5onefifth2/5

twofifths1/5oneinfive或oneoutoffive十二、百分数表达法eg:45%forty-fivepercent十三、倍数表达法A、Ais+倍数as+adj./adv.原级(many/much+n.)+as+Beg:LineAisthreetimesa

slongaslineB.(AustraliahasfourteentimesasmanypeopleasAmerica.)B、Ais+倍数+adj./adv.比较级+thanBeg:LineAistwicelonger

thanlineB.C、Ais+倍数+the+相应n.(height/width/length/size)+of+Beg:LineAisthreetimesthelengthoflineB.D、Ais+倍数+that/those+ofBeg:Tom’s

ageistwicethatofJim’s.十四、编号顺序的表达eg:第一课Lessonone着重编号theFirstLesson着重顺序