SelfcheckUnit8Whenisyourbirthday
onetwothreefourfivesixseveneightninetenfirstsecondthirdfourthfifthsixthseventheighthninthtenth1st2nd3rd4th5th6th7th8th9th10th基数词序数词基变序,有规律,词尾加上th
123,特殊记,词尾字母t,d,d
8去t,9去e,f来把ve替
eleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwentyeleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenthtwentieth11th12th13th14th15th16th17th18th19th20th基数词序数词twenty-onetwenty-twotwenty-threethirtythirty-onetwenty-firsttwenty-secondtwenty-thirdthirtieththirty-first21st22nd23rd30th31st整十y变i,th前有小e来基数词序数词Writeouttheordinalnumbers第一第二第三第五第八第九第十二firstsecondthird1st2nd3rdfiftheighthninth5th8th9th12thtwelfth第二十第二十一第三十第三十三第四十第四十五twentiethtwenty-firstthirtiethfortieththirty-thirdforty-fifth20th21st30th33rd40th45th1
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