语法专项突破专题四数词考点一基数词(表数量)数字基数词形式例词0~12各自独立zero0;one1;nine9;twelve1213~193~9+重读teen结尾特殊:thirteen13;fifteen15;eighteen18一般:fourteen14;sixteen1620~90整位数以ty结尾twenty20;thirty30;forty40;fifty50;eighty80两位数(几十几)整位数个位数thirtyfive35三位数(几百几)
hundred+and+两位数sixhundredandsixtysix666多位数从右向左数起,每隔三位数加一个逗号,依次读作thousand(千)、million(百万)、billion(十亿),逗号中间按三位数读89,696,787,656eightyninebillion,sixhundredandninetysixmillion,sevenhundredandeightyseventhousand,sixhundredandfiftysix考点二序数词(表顺序)数字序数词变化规则例词1、2、3不规则变化first,second,third4~19基数词尾加th特殊:fifth第五;eighth第八;ninth第九;twelfth第十二;一般:fourth第四;nineteenth第十九20~90整位数ty变为tie再加thtwenty→twentieth;ninety→ninetieth两位数或多位数(整数除外)只变个位数(hundred,thousand等只在词尾加th)twentythird第23;onehundredandfifty-ninth第159;hundredth第100【提醒】(1)序数词要加定冠词the,但若序数词前有形容词性物主代词或名词所有格时省略the
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