【not only but also 的倒装句型】在英语语法中，“not only... but also...” 是一个常见的并列结构，用于强调两个并列的成分。当这个结构位于句首时，为了强调或使句子更正式，常常会使用倒装语序。这种倒装句型在书面语和正式场合中较为常见。
一、基本用法
“not only... but also...” 的正常语序为：
> He not only studies English but also plays the piano.
当将 “not only... but also...” 放在句首时，句子需要进行倒装：
> Not only does he study English, but also he plays the piano.
二、倒装规则
1. 主语和助动词/情态动词的位置交换
如果主语是代词（如 he, she, they）或名词，且句子中有助动词（如 do, does, did, can, will 等），则需将助动词提前到主语前。
2. 没有助动词时
如果原句中没有助动词或情态动词，则需要用 “do” 来构成倒装结构。
三、常见例句对比
| 正常语序 | 倒装语序 |
| She not only sings, but also dances. | Not only does she sing, but also she dances. |
| They not only passed the exam, but also got a scholarship. | Not only did they pass the exam, but also they got a scholarship. |
| He not only speaks French, but also writes it well. | Not only does he speak French, but also he writes it well. |
| I not only like coffee, but also tea. | Not only do I like coffee, but also I like tea. |
四、注意事项
- 倒装只发生在 “not only... but also...” 位于句首时。
- “not only... but also...” 后面的两个部分应保持一致的语法结构（如都是动词原形、都是名词等）。
- 在口语中，倒装结构较少使用，更多出现在书面语中。
五、总结
| 内容 | 说明 |
| 定义 | “not only... but also...” 的倒装句型用于强调两个并列成分，常用于正式语境。 |
| 结构 | “not only + 助动词/情态动词 + 主语 + 动词... but also + 主语 + 动词...” |
| 使用场景 | 正式写作、演讲、学术文章等场合。 |
| 注意事项 | 只有当 “not only... but also...” 位于句首时才需要倒装；前后成分要对称。 |
通过掌握这一句型，可以提升语言表达的多样性与正式程度，尤其在写作和考试中具有实用价值。
