初中英语语法概念数词就是表示事物的数量和顺序的词,分基数词和序数词两种。表示数目或数量多少的词叫基数词,如:one,ten,fifteen等;表示数目顺序的词叫序数词,如:fifth,second,twelfth等。。一、基数词一、基数词::1.1.基数词的形式:基数词的形式:AA..从从1——101——10::oneone,,twotwo,,threethree,,fourfour,,fivefive,,sixsix,,sevenseven,,eighteight,,ninenine,,tenten..BB..从从11——1911——19::eleveneleven,,twelvetwelve,,thirteenthirteen,,fourteenfourteen,,fifteenfifteen,,sixteensixteen,,seventeenseventeen,,eighteeneighteen,,nineteennineteen..注意注意::这里除这里除eleveneleven,,twelvetwelve,,thirteenthirteen,,fifteenfifteen,,eighteeneighteen为特殊形式为特殊形式外,外,fourteenfourteen,,sixteensixteen,,seventeenseventeen,,nineteennineteen都是由其个位数形式都是由其个位数形式后添加后缀后添加后缀-teen-teen构成。构成。CC..从从21——9921——99::整数几十中除整数几十中除twentytwenty,,thirty,fortythirty,forty,,fiftyfifty,,eightyeighty为特殊形为特殊形式式外,外,sixtysixty,,seventyseventy,,ninetyninety都是其个位数形式后添加后缀都是其个位数形式后添加后缀-ty-ty构构成。表示几十几时,在几十和个位基数词形式之间添加连字符成。表示几十几时,在几十和个位基数词形式之间添加连字符““-”-”。例如:。例如:21twenty-one21twenty-one76seventy-six76seventy-six注意注意::fortyforty的拼写。的拼写。DD..百位数:百位数:基数词基数词101101~~999999,先说“几百”,再加“,先说“几百”,再加“and”and”,再加末两位数。,再加末两位数。101ahundredandone101ahundredandone320threehundredandtwenty320threehundredandtwenty648sixhundredandforty-eight648sixhundredandforty-eight注意注意::在几十和个位基数词形式之间添加连字符“在几十和个位基数词形式之间添加连字符“-”-”。。29,43150076,,thousandhundredmillionbillionand6)1,000以上数目,从右向左每三位用“,”分开,分别读为thousand,million,billion,注意:这几个词不能用复数形式,后也不能加and。EE..千位数以上:千位数以上:10001000以上数目以上数目,,从右向左每三位用“,”分开从右向左每三位用“,”分开,,分别读为分别读为thousand,thousand,million,billionmillion,billion。例如:例如:5,237,166,2345,237,166,234读作读作::2,6482,64816,250,06416,250,064billionmillionthousandhundredandfivebillionfivebillion,,twohundredandthirty-sevenmilliontwohundredandthirty-sevenmillion,,oneonehundredandsixty-sixthousandhundredandsixty-sixthousand,,twohundredandthirty-fourtwohundredandthirty-fourtwothousand,sixhundredandforty-eighttwothousand,sixhundredandforty-eightsixteenmillion,twohundredandfiftythousand,sixty-foursixteenmillion,twohundredandfiftythousand,sixty-four22.基数词用法:.基数词用法:⑴⑴、、表示具体数目表示具体数目,hundred,thousand,million,hundred,thousand,million不用复数。表示不不用复数。表示不确定数目确定数目,,用复数。即用复数。即hundredsof(hundredsof(数百数百),thousandsof(),thousandsof(数千数千),),millionsof(millionsof(数百万数百万)+)+名词复数名词复数,,可以用可以用many/severalmany/several修饰,但不修饰,但不能与具体数目连用。能与具体数目连用。1)Ourcountryhasapopulationof1)Ourcountryhasapopulationof1,300million1,300millionpeople.people.2)Thereare2)Therearethreethousandthreethousandstudentsinourschool.studentsinourschool.3)Afterthewar,3)Afterthewar,thousandsofthousandsofpeoplebecamehomeless.peoplebecamehomeless.4)4)Several/ManythousandsofSeveral/Manythousandsoftreesmustbeplantedeveryyear.treesmustbeplant...