【1到100的序数词是什么】在英语中，序数词是用来表示顺序或位置的词，如“第一”、“第二”等。了解1到100的序数词对于学习英语、写作或日常交流都非常有帮助。以下是对1到100序数词的总结，并附上表格以便查阅。
一、序数词的基本规则
1. 1-3：
- 第一：first
- 第二：second
- 第三：third
2. 4-20：
- 从第四开始，通常在基数词后加 -th，但有一些例外：
- 第四：fourth
- 第五：fifth
- 第六：sixth
- 第七：seventh
- 第八：eighth
- 第九：ninth
- 第十：tenth
- 第十一：eleventh
- 第十二：twelfth
- 第十三：thirteenth
- 第十四：fourteenth
- 第十五：fifteenth
- 第十六：sixteenth
- 第十七：seventeenth
- 第十八：eighteenth
- 第十九：nineteenth
- 第二十：twentieth
3. 21-99：
- 十位为“twenty”、“thirty”等时，个位是1-9，用“-th”结尾。
- 如：twenty-first, thirty-second, forty-third 等。
4. 整十数（如30、40等）：
- 直接加 -th，如：thirtieth, fortieth, fiftieth 等。
二、1到100的序数词表
| 基数词 | 序数词 | 基数词 | 序数词 | 基数词 | 序数词 |
| 1 | first | 34 | thirty-fourth | 67 | sixty-seventh |
| 2 | second | 35 | thirty-fifth | 68 | sixty-eighth |
| 3 | third | 36 | thirty-sixth | 69 | sixty-ninth |
| 4 | fourth | 37 | thirty-seventh | 70 | seventieth |
| 5 | fifth | 38 | thirty-eighth | 71 | seventy-first |
| 6 | sixth | 39 | thirty-ninth | 72 | seventy-second |
| 7 | seventh | 40 | fortieth | 73 | seventy-third |
| 8 | eighth | 41 | forty-first | 74 | seventy-fourth |
| 9 | ninth | 42 | forty-second | 75 | seventy-fifth |
| 10 | tenth | 43 | forty-third | 76 | seventy-sixth |
| 11 | eleventh | 44 | forty-fourth | 77 | seventy-seventh |
| 12 | twelfth | 45 | forty-fifth | 78 | seventy-eighth |
| 13 | thirteenth | 46 | forty-sixth | 79 | seventy-ninth |
| 14 | fourteenth | 47 | forty-seventh | 80 | eightieth |
| 15 | fifteenth | 48 | forty-eighth | 81 | eighty-first |
| 16 | sixteenth | 49 | forty-ninth | 82 | eighty-second |
| 17 | seventeenth | 50 | fiftieth | 83 | eighty-third |
| 18 | eighteenth | 51 | fifty-first | 84 | eighty-fourth |
| 19 | nineteenth | 52 | fifty-second | 85 | eighty-fifth |
| 20 | twentieth | 53 | fifty-third | 86 | eighty-sixth |
| 21 | twenty-first | 54 | fifty-fourth | 87 | eighty-seventh |
| 22 | twenty-second | 55 | fifty-fifth | 88 | eighty-eighth |
| 23 | twenty-third | 56 | fifty-sixth | 89 | eighty-ninth |
| 24 | twenty-fourth | 57 | fifty-seventh | 90 | ninetieth |
| 25 | twenty-fifth | 58 | fifty-eighth | 91 | ninety-first |
| 26 | twenty-sixth | 59 | fifty-ninth | 92 | ninety-second |
| 27 | twenty-seventh | 60 | sixtieth | 93 | ninety-third |
| 28 | twenty-eighth | 61 | sixty-first | 94 | ninety-fourth |
| 29 | twenty-ninth | 62 | sixty-second | 95 | ninety-fifth |
| 30 | thirtieth | 63 | sixty-third | 96 | ninety-sixth |
| 31 | thirty-first | 64 | sixty-fourth | 97 | ninety-seventh |
| 32 | thirty-second | 65 | sixty-fifth | 98 | ninety-eighth |
| 33 | thirty-third | 66 | sixty-sixth | 99 | ninety-ninth |
| 100 | hundredth | 100 | hundredth |
三、注意事项
- 在正式写作中，序数词通常小写，如：“He came in first.”
- 在某些情况下，也可以使用数字形式，如：“The 1st prize was awarded to him.”
- 对于较大的数字，如“100”，可以直接写成 hundredth，而不用拆分。
通过以上总结和表格，可以清晰地看到1到100的序数词变化规律，便于记忆和使用。掌握这些序数词有助于提高英语表达的准确性与自然度。