定义 / 说明
当某些否定或限制性副词置于句首时，英语常触发倒装：助动词前置，如 Never have I seen...、Rarely do we get...。该结构较正式，具有较强修辞效果。常见于写作、演讲、严谨论证，在日常口语中较少。因语序“有标记”，它常传达强调、惊讶或刻意修饰的文体感。
关键规则
- 常见触发词：never, rarely, seldom, hardly, scarcely, little, not only。
- 这些副词前置后，助动词与主语倒装：Rarely do we see...
- 若原句无助动词，用 do/does/did。
- 该模式偏正式；中性口语中常规语序更自然。
- 一些结构成对出现：Hardly had ... when ..., Not only ... but also ...。
例句
- Never have I seen that before. - 我从未见过那样的事。
- Rarely do we get a chance like this. - 我们很少有这样的机会。
- Not only did she apologise, but she also offered to help. - 她不仅道歉了，还主动提出帮忙。
- Hardly had I sat down when the phone rang. - 我刚坐下电话就响了。
- Little did they know what was coming. - 他们几乎不知道将要发生什么。
常见错误
- ❌ Never I have seen that before. -> ✅ Never have I seen that before.
- ❌ Rarely we get a chance like this. -> ✅ Rarely do we get a chance like this.
- ❌ Hardly I had arrived when it started. -> ✅ Hardly had I arrived when it started.
提示
- 记忆：前置否定副词 -> 助动词在主语前。
- 若语境不正式，可改回常规语序。