定语从句必用that的几种情形
作者：申小雅（高考志愿填报专家）
发布时间：2025-02-18 06:40:17
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在定语从句中，that这个词有着特殊的重要性，尤其在某些特定情境下，它几乎是唯一的选择。今天，咱们就来聊聊定语从句中只能用that的几种情况。
1形容词最高级修饰先行词
当定语从句修饰的词（即先行词）前面有形容词最高级修饰时，比如“This is the best film that I have seen.”，这里的film被the best修饰，此时只能用that来引导定语从句。
2特定修饰词限制先行词
先行词被the very/the only/the same/the last等词修饰时，同样只能用that。例如，“She is the only girl who has got a prize.”（注意，尽管原句用了who，但按照规则，此处应更正为that。）
3序数词修饰先行词
先行词被序数词修饰时，也必须用that。比如，“The first place that they visited was the Big Ben.”
4先行词为不定代词
当先行词正好是anything/everything/nothing/few/all/none/little/some等词时，也只能用that。例如，“All that can be done has been done.”
5疑问代词与先行词搭配
先行词前面有who/which等疑问代词时，为避免重复，通常也用that。如，“Who is the man that is standing there?”
6先行词包含人与物
当先行词既有人也有物时，为了统一，只能用that。比如，“The writer and his work that you told me are really famous.”
以上，就是定语从句中只能用that的几种典型情况。掌握这些规则，不仅能帮助我们更准确地使用英语，还能在考试中避免不必要的失分。记住，英语学习，细节决定成败！
| 情况 | 示例 | 说明 |
|---|
| 形容词最高级 | This is the best film that I have seen. | 先行词被形容词最高级修饰 |
| 特定修饰词 | She is the only girl that has got a prize. | 先行词被the only等词修饰 |
| 序数词 | The first place that they visited was the Big Ben. | 先行词被序数词修饰 |
| 不定代词 | All that can be done has been done. | 先行词为不定代词 |
| 疑问代词搭配 | Who is the man that is standing there? | 先行词前有疑问代词 |
| 人与物并存 | The writer and his work that you told me are really famous. | 先行词既有人也有物 |
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