基数词变序数词基数词(表示个数的词)1-one一个2-two两个3-three三个4-four四个5-five五个9-nine九个12-twelve十二个20-twenty二十个21-twenty-one二十一个30-thirty三十个first(1st)第一ninth(9th)第九second(2nd)第二fourth(4th)第四third(3rd)第三thirtieth(30th)第三十twenty-first(21st)第二十一twentieth(20th)第二十fifth(5th)第五twelfth(12th)第十二序数词(表示顺序的词)基数词变序数词的口诀基变序，有规律词尾加上thfourth一/二/三/，全变体onefirsttwosecondthreethird八去t,九去eeightthninethVe要用f替fivefth以y结尾变ietwentyieth遇到几十几，只变个位就可以thirty-onefirst基数词变序数词的口诀基变序，有规律词尾加上th，(fourth,sixth)一、二、三，全变体(first,second,third)八去t，九去e(eighth,ninth)ve要用f替(fifth,twelfth)以y结尾变ie(twenty----twentieth)遇到几十几只变个位就可以(twenty-four--twenty-fourth)制作：沁阳市第二中学李娜
