first 1st 第一
second 2nd 第二
third 3rd 第三
fourth 4th 第四
fifth 5th 第五
sixth 6th 第六
seventh 7th 第七
eighth 8th 第八
ninth 9th 第九
tenth 10th 第十
eleventh 11th 第十一
twelfth 12th 第十二
thirteenth 13th 第十三
twentieth 20th 第二十
thirtieth 30th 第三十
fortieth 40th 第四十
fifty-first 51st 第五十一
sixty-second 62nd 第六十二
seventy-third 73rd 第七十三
eighty-forth 84th 第八十四
ninety-fifth 95th 第九十五
1. 英语序数词1-19中,第一,第二,第三是特殊形式,其余都是在基数词的后面加上-th。
2. 有几个序数词加-th时的拼法不规则,它们是:fifth, eighth, ninth, twelfth。
3. 十位数整数的序数词的构成方法是:将整数基数词的词尾-ty中的y改写成i,然后加-eth。
4. 基数词几十几改成序数词的时候,只要把个位数改成序数词,十位数不变。如 twenty-one 变成 twenty-first。
5. 序数词的缩写形式,在阿拉伯数字的后面加上序数词的最后两个字母。如:1st, 2nd, 3rd, 4th, 5th, 6th, 7th, ...41st, 52nd, 63rd, 74th。
6. hundred, thousand, million 等序数词形式为 hundredth, thousandth, millionth。如:five hundredth (500th) 第500,ten thousandth (10000th) 第10000。
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