在英语中，not only...but also... 是一个高频且重要的并列连词，用于强调两个并列成分，尤其是后者。它不仅是考试重点，更是提升英语表达层次的关键结构。
not only...but also... 意为“不仅……而且……”，用于连接两个语法功能相同的成分，强调后者（also 有时可省略）。
| 连接成分 | 示例 | 说明 |
|---|---|---|
| 名词 | She likes not only apples but also oranges. | 连接两个宾语 |
| 动词 | He not only sings but also dances. | 连接两个谓语动词 |
| 形容词 | The movie is not only interesting but also meaningful. | 连接两个表语 |
| 介词短语 | They traveled not only in Europe but also in Asia. | 连接两个地点状语 |
| 从句 | Not only did he finish the work, but he also helped others. | 连接两个句子（注意倒装） |
当 not only 位于句首时，其后的主句需要部分倒装（即助动词/情态动词提前），但 but also 部分不需要倒装。
| 类型 | 正确示例 | 错误示例 |
|---|---|---|
| 非倒装（正常语序） | She not only plays piano but also teaches music. | She not only plays piano but also teaches music. （无误） |
| 倒装（Not only 在句首） | Not only does she play piano, but she also teaches music. | Not only she plays piano but also teaches music. （错误：无双助动词） |
记忆技巧：Not only 开头 → 句子要倒装！类似结构还有 Never、Seldom 等否定词开头的句子。
also 可以紧贴 but，也可置于谓语动词前或句末，甚至省略（口语中常见）。但正式写作中建议保留。
| also 位置 | 示例 |
|---|---|
| but also + 名词/动词 | She is not only a writer but also a painter. |
| but + 主语 + also + 谓语 | Not only did he call, but he also sent an email. |
| also 省略 | He not only cooked but cleaned the kitchen. （= but also cleaned） |
使用 not only...but also... 时，中国学习者常犯以下错误：
| 错误类型 | 错误示例 | 修正后 |
|---|---|---|
| 不对称结构 | She not only likes swimming but also to run. （动词形式不一致） | She likes not only swimming but also running. |
| 倒装错误 | Not only she is smart, but also kind. （无双助动词） | Not only is she smart, but she is also kind. |
| also 重复 | He not only also speaks English but also French. （also 重复） | He speaks not only English but also French. |
除了标准形式，not only...but also... 还有几种变体：
写作提升 tip：在学术写作中，not only...but also... 能增强逻辑性和层次感，避免单调的 and 连接。
1. 改写句子：He both plays football and basketball. （用 not only...but also...）
2. 改正错误：Not only she speaks English but also French.
3. 翻译：她不仅完成了项目，还提前了一天。
1. He plays not only football but also basketball.
2. Not only does she speak English but also French. / She speaks not only English but also French.
3. She not only completed the project but also finished it one day ahead.
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