教英語11年、念漢字10年、在中國住6年的外國人說：
有1的加st，有2的加nd，有3的加rd，其余加th，除了11-13外。
1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th
11th, 12th,13th, 14th, 15th, 16th, 17th, 18th, 19th, 20th
21st, 22nd, 23rd, 24th, 25th, 26th, 27th, 28th, 29th, 30th
31st
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| 第一 | first | 1st |
| 第二 | second | 2nd |
| 第三 | third | 3rd |
| 第四 | fourth | 4th |
| 第五 | fifth | 5th |
| 第六 | sixth | 6th |
| 第七 | seventh | 7th |
| 第八 | eighth | 8th |
| 第九 | ninth | 9th |
| 第十 | tenth | 10th |
| 第十一 | eleventh | 11th |
| 第十二 | twelfth | 12th |
| 第十三 | thirteenth | 13th |
| 第十四 | fourteenth | 14th |
| 第十五 | fifteenth | 15th |
| 第十六 | sixteenth | 16th |
| 第十七 | seventeenth | 17th |
| 第十八 | eighteenth | 18th |
| 第十九 | nineteenth | 19th |
| 第二十 | twentieth | 20th |
| 第二十一 | twentieth-first | 21st |
| 第二十二 | twentieth-second | 22nd |
| 第二十三 | twentieth-third | 23rd |
| 第二十四 | twentieth-fourth | 24th |
除第11、第12、第 13，數(shù)字后加 th 外，逢1，2，3都是加 st 、nd 、rd，如此類推：
1st 2nd 3rd ... 4th 5th 6th 7th ... 20th
21st 22nd 23rd ... 24th 25th ... 30th
31st 32nd 33rd ... 34th 35th ... 40th
