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seven seventh
eight eighth
nine ninth
ten tenth
基数词 序数词
eleven eleventh
twelve twelfth
thirteen thirteenth
fourteen fourteenth
fifteen fifteenth
sixteen sixteenth
seventeen seventeenth
eighteen eighteenth
nineteen nineteenth
twenty twentieth
twenty-one twenty- first
twenty- two twenty-second
twenty- three twenty- third
twenty- four twenty- fourth
twenty- five twenty- fifth
twenty- six twenty-sixth
twenty- seven twenty- seventh
twenty- eight twenty- eighth
twenty- nine twenty- ninth
thirty thirtieth
thirty- one thirty- first
【记忆口诀】
基变序，有规律，多数词尾加-th。
一、二、三特殊记，词尾字母t, d, d。
八去t, 九去e，字母f把ve替，然后再加