英語(yǔ)上數(shù)詞分為兩大類(lèi)：基數(shù)詞和序數(shù)詞.
基數(shù)詞是表示數(shù)目的詞稱(chēng)為基數(shù)詞,（1）．從1——10 one,two,three,four,five,six,seven,eight,nine,ten． （2）．從 11——19 eleven,twelve, thirteen, fourteen, fifteen, sixteen, seventeen,eighteen, nineteen．
序數(shù)詞是表順序的,1）從第一至第十九： one— first two— second/next three— third four-fourth five— fifth six— sixth seven— seventh eight—eighth nine—ninth ten— tenth eleven— eleventh twelve— twelfth thirteen —thirteenth fourteen—fourteenth fifteen—fifteenth sixteen—sixteenth seventeen—seventeenth eighteen—eighteenth nineteen—nineteenth 大多的序數(shù)詞都是由其相對(duì)應(yīng)的基數(shù)詞后面添加“th”構(gòu)成. （2）從第二十至第九十九 整數(shù)第幾十的形式由其對(duì)應(yīng)的基數(shù)詞改變結(jié)尾字母y為ie,再加“th”構(gòu)成. twenty——twentieth thirty——thirtieth