什么是基数词和序数词呢？
基数词：指描述事物数量多少的词。序数词：指表示顺序的数词。
1. (1-10)基数词）：one. two. three. four. five. six. seven. eight. nine. ten.
2. (1-10)序数词） ：first. second. third. fourth. fifth. sixth. seventh. eighth. ninth. tenth.
总结规则：基数词1-10变序数词的规则，直接在后面加th 。 但是第一first，第二second，第三third不一样。还要注意第五是把five后面的ve变成f再加th,第八因为尾部已经有一个t, 所以直接加上h 。第九把nine后面的e 去掉再加th。
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, 但是要注意的是第十二，是把十二twelve的ve 变成f,再加th。
5. （21-29)基数词）：twenty-one, twenty-two, twenty-three, twenty-four, twenty-five, twenty-six, twenty-seven, twenty-eight, twenty-nine.
6. （21-29)序数词）：twenty-first, twenty-second, twenty-third, twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth.
总结规则：基数词二十几 十位上和个位数的数都是基数词。三十几，四十几...九十几亦是如此。
7. (20-90)基数词）：twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety.
8. (20-90)序数词）：twentieth, thirtieth, fortieth, fiftieth, sixtieth, seventieth, eightieth, ninetieth.
总结规则：基数词几十都是-ty结尾的，变序数词时把y 变ie ，再加-th.
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