序数词英语怎么记

基变序，有规律。词尾加上th 。 一二三，特殊记。词尾字母tdd ，八少t ，九去e 。F来把ve替 ，整十变v为ie后跟th莫迟疑要想表示几十几只变个位就可以

除了1，2，3以外剩下的都是在词尾加th1是first2是second3是third有帮助清采纳~不懂欢迎追问~

1到20的英语序数词 1）序数词第一至第二十的数字为: first (1st) second (2nd) third (3rd) fourth (4th) fifth (5th) sixth (6th) seventh (7th) eighth (8th) ninth (9th) tenth (10th) eleventh (11th) twelfth(12th) thirteenth (13th) fourteen (14th) fifteenth (15th) sixteenth (16th) seventeen (17th) eighteenth (18th) nineteenth (19th) twentieth (20th) 注：英语序数词第1-19除了first、 second、 third 有特殊形式外，其余均由基数词加后缀-th 构成。望满意