英语上数词分为两大类：基数词和序数词.

　　基数词是表示数目的词称为基数词,（1）．从1——10one,two,three,four,five,six,seven,eight,nine,ten．（2）．从11——19eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen．

　　序数词是表顺序的,1）从第一至第十九：one—firsttwo—second/nextthree—thirdfour-fourthfive—fifthsix—sixthseven—seventheight—eighthnine—ninthten—tentheleven—eleventhtwelve—twelfththirteen—thirteenthfourteen—fourteenthfifteen—fifteenthsixteen—sixteenthseventeen—seventeentheighteen—eighteenthnineteen—nineteenth大多的序数词都是由其相对应的基数词后面添加“th”构成.（2）从第二十至第九十九整数第几十的形式由其对应的基数词改变结尾字母y为ie,再加“th”构成.twenty——twentieththirty——thirtieth