基数词变序数词1-100答:4、20-90的基数词:twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety.5、100 基数词 :hundred.6、1-10的序数词:first. second. third. fourth. fifth. sixth. seventh. eighth. ninth. tenth.7、11-19的序数词:eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth...