序数词和基数词的区别?答:3. (11-19)基数词): eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen.4. (11-19)序数词): eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth.总结规则:基数词11-19变序数词,在此基础上加上th, 但是...