Question

1—21基数词与序数词?快1——21的“基数词与序数词”急

Answer 1

基数词one two three four five six seven eight

nine ten eleven twelve thirteen fourteen

fifteen sixteen seventeen eighteen nineteen

twenty twenty-one

序数词first second third fourth fifth sixth seventh eighth

ninth tenth eleventh twelfth thirteenth fourteenth

fifteenth sixteenth seventeenth eighteenth nineteenth

twentieth twentieth-first