1 one 2 two 3 three 4 four 5 five 6 six 7 seven 8 eight 9 nine
10 ten 11 eleven 12 twelve 13 thirteen 14 fourteen 15 fifteen
16 sixteen 17 seventeen 18 eighteen 19 nineteen 20 twenty
扩展资料：
1-20的序数词
first(第一) second (第二) third(第三) fourth(第四) fifth(第五)
sixth(第六) seventh(第七) eighth(第八) ninth(第九) tenth(第十)
eleventh(第十一) twelevth(第十二) thirteenth(第十三）
fourteenth(第四)fifteenth(五)sixteenth(第十六)seventeenth(第十七)
eighteenth(第十八) ninteenth(第十九) twentith(第二十)
我们学习英语，能学会所有的因素和发音规则，也有可能掌握所有的语法和规则，但要学会所有的单词是无法做到的。且不说外语学习者。即便把英语作为母语使用的人也难以达到这一目标。
参考资料：百度百科-序数词
温馨提示：答案为网友推荐，仅供参考
第1个回答 推荐于2017-09-20
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第2个回答 2012-04-11
one,two,three,four,five,six,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty.
第3个回答 2012-05-17
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第4个回答 2012-03-22
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