【在句子中but的用法?详细!】“but”是一个常见的英语连词，常用于连接两个句子或短语，表示转折关系。虽然它看似简单，但在实际使用中有很多需要注意的地方。下面我们将从基本用法、常见搭配、特殊结构以及常见错误等方面进行总结，并以表格形式清晰展示。
一、基本用法
“but”主要用来表达“但是”，表示前后两个部分之间的对比或转折。它可以连接两个并列的句子、短语或从句。
例句：
- I wanted to go, but I was too tired.
- She is smart, but she is not always polite.
二、常见搭配与结构
| 结构 | 说明 | 例句 |
| S + V + but + S + V | 连接两个主谓结构 | He likes coffee, but she prefers tea. |
| S + V + but + V-ing | 连接一个主句和一个现在分词结构 | I tried to help, but I was too late. |
| S + V + but + that-clause | 连接主句和that引导的宾语从句 | She said she would come, but she didn’t. |
| Not only... but also... | 表示“不仅……而且……” | He is not only kind, but also honest. |
三、特殊用法与注意事项
1. But 有时可以省略
在口语中，有时“but”可以被省略，但意思不变。
- I like it, (but) I don’t think it’s the best choice.
2. But 与 no 的搭配
“no”后面可以跟“but”来加强语气。
- There is no problem, but you need to be careful.
3. But 后面不能接 and
“but”本身已经表示转折，不能再与“and”连用。
- ❌ I like apples, but and oranges.
- ✅ I like apples, but I also like oranges.
4. But 有时用于否定句中
在否定句中，“but”可以强调某种情况。
- I didn’t say anything, but I thought about it.
四、常见错误对比
| 正确 | 错误 | 原因 |
| She is beautiful, but she is not friendly. | She is beautiful, and she is not friendly. | “and”表示顺承，不能表达转折 |
| He ran fast, but he still lost. | He ran fast, but and he still lost. | “but”后不能接“and” |
| I want to go, but I can’t. | I want to go, but I can't. | 拼写错误（can't = cannot） |
五、总结
“but”是英语中非常重要的连词，主要用于表达转折关系。掌握它的正确用法可以帮助我们更准确地表达复杂的意思。通过理解其基本结构、常见搭配以及常见错误，我们可以避免在写作和口语中出现不必要的失误。
| 用法类型 | 说明 | 示例 |
| 转折 | 表示前后对比 | I like music, but I don’t play any instrument. |
| 强调 | 加强语气 | There is no solution, but we can try. |
| 特殊结构 | 如 not only... but also... | She is not only smart, but also hardworking. |
| 常见错误 | 与 and 混用、拼写错误等 | ❌ I like apples, but and oranges. ✅ I like apples, but I also like oranges. |
通过以上内容，相信你对“but”的用法有了更全面的认识。在实际使用中，多加练习和观察会帮助你更加自然地运用这个词。
