基数词的定义表示数目的词是基数词
基数词onesixtwoseventhreeeightfourninefiveteneleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwentytwenty—onetentwentythirtyfortyfiftysixtyseventyeightyninetyonehundred序数词的定义表示数目顺序的词用序数词
例如:first第一，fifth第五four→fourthsix→sixthseven→seventhten→tentheleven→elevenththirteen→thirteenth基变序，有规律，词尾加上th
one→firsttwo→secondthree→third一，二，三，特殊记，词尾分别t，d，d
eight→eighthnine→ninthtwelve→twelfth八减t，九去e，f来把ve替
twenty→twentieththirty→thirtiethforty→fortietheighty→eightiethninety→ninetiethty如果做结尾，直接把y变ie
twenty-one→twenty-firsttwenty-two→twenty-secondthirty-three→thirty-thirdforty-five→forty-fifthsixty-seven→sixty-seventh若是碰到几十几，只变个位就可以
基变序，有规律，词尾加上th;1、2、3特殊记，词尾分别t，d，d；八减t,九去e,f来把ve替；ty如果做结尾，直接把y变ie;若是碰到几十几，只变个位就可以．基变序口诀：序数词的用法前面要加定冠词the
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