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1、基数词：one, two , three, four, five 序数词：第一，第二，第三，第四， 第五.口诀：一二三单独记。基数词序数词onefirst1sttwosecond2ndthreethird3rd八去t，九去e，ve要用f替。基数词序数词fivefifth5theighteighth8th nineninth9th twelvetwelfth12th 整十基数变序数，先把ty变成tie基数词序数词twentytwentieth20th thirtythirtieth30th fortyfortieth 40th 要是遇到两位数，十位基数个位序，th最后加上去。基数词序数词twen
2、ty-onetwenty-first21sttwenty-twotwenty-second22nd twenty-threetwenty-third23rd twenty-four twenty-fourth24th twenty-fivetwenty-fifth25th twenty-sixtwenty-sixth26th Practice请把下面的基数词换成序数词并写出缩写one-two-three-four-five-eight-nine-twelvethirteen-twenty-twenty-one twenty-two thirty-three- thirty-five-thirty-seven- forty-
