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fivefifth5theighteighth8thnineninth9thtwelvetwelfth12th整十基数变序数,先把ty变成tie基数词序数词twentytwentieth20ththirtythirtieth30thfortyfortieth40th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twenty-onetwenty-first21sttwenty-twotwenty-second22ndtwenty-threetwenty-third23rdtwenty-fourtwenty-fourth24thtwenty-fivetwenty-fifth25thtwenty-sixtwenty-sixth26thPractice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-
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