英语倒装句是一种常见的语法结构，强调语气、表示反问或条件等。完全倒装句将谓语动词放在主语前，如“Never have I seen such a beautiful sunset.” 部分倒装句将助动词、情态动词或副词放在主语前，如“Never before have I tasted such delicious food.” 条件句倒装句用于表示“如果……将会怎样”的条件语句，如“Had I known your plan, I would have joined you.”
1. 完全倒装句
完全倒装句是指将谓语动词放在主语之前的倒装结构，其基本结构为“谓语动词+主语”。
例句：
- Never have I seen such a beautiful sunset.（我从未见过如此美丽的日落。）
- Hardly had I arrived home when it started to rain.（我刚到家天就开始下雨了。）
- Little did he know that he was being followed.（他根本不知道有人在跟踪他。）
2. 部分倒装句
部分倒装句是指将助动词、情态动词或者某些副词放在主语之前的倒装结构，其基本结构为“助动词/情态动词/副词+主语+谓语动词”。
例句：
- Never before have I tasted such delicious food.（我从未尝过如此美味的食物。）
- Only when we face difficulties can we grow stronger.（只有面对困难我们才能变得更加坚强。）
- Rarely do I watch TV at home.（我很少在家看电视。）
3. 条件句倒装句
条件句倒装句是指将主语和动词的位置互换，用于表示“如果……将会怎样”的条件语句。
例句：
- Had I known your plan, I would have joined you.（如果我知道你的计划，我就会加入你。）
- Were it not for your help, I couldn't have finished the project.（如果不是你的帮助，我不可能完成这个项目。）
- Should you have any questions, do not hesitate to contact me.（如果你有任何问题，请毫不犹豫地联系我。）
