英语句子的自然顺序是:
主语+动词+ . . . .
但有时也会变成：
（动词+主语）
这种情况就是倒装用法了。
在文章英语语法（点击标题，即可阅读）：not only... but also 的倒装用法中，重点分享了not only放在句首时，用倒装的用法。
那么除了not only外，还有哪些情况需要用倒装呢？
今天来分享在没有连词的条件句中，出现倒装的情况。
1. 条件句中用过去完成时
如原句为：
If she had seen the sign, she would have stopped.
如果她看到那个标志，她就会停下来了。
当去掉了连词if时，之后要用倒装：
Had sheseen the sign, she would have stopped.
Had he been there, he could have seen it.
如果他在那里，他会看到的。
2. 条件句中用一般现在时
如原句为：
If you need help, please ask.
我从来没有这么难过过。
当去掉了连词if时，之后要用倒装：
Should youneed help, please ask..
3. 条件句为用虚拟从句
如原句为：
If I were you, I would reconsider.
如果我是你，我会重新考虑。
当去掉了连词if时，之后要用倒装：
Were I you, I would reconsider..
如原句为：
If she were here, she could answer that.
如果她在这里，她会回答的。
当never 位于句首时，之后要用倒装：
Were she here, she could answer that...
如原句为：
If I were in your position, I would apologise.
如果我处在你的位置，我会道歉的。
当去掉了连词if时，之后要用倒装：
Were I in your position, I would apologise.
Were I the president, I could do the good things.
如果我是总统，我可以做一些好事。
Were he my brother, I would support him to reach his dreams.
如果他是我的兄弟，我会支持他实现他的梦想。
4. 条件句中用Should
如原句为：
If you should encounter any issues, please let us know.
如果你遇到任何问题，请让我们知道。
当去掉了连词if时，之后要用倒装：
Should you encounter any issues, please let us know..
如原句为：
If it should rain, we’ll stay indoors.
万一下雨，我们就呆在室内。
当去掉了连词if时，之后要用倒装：
Shouldit rain, we’ll stay indoors.
Should you go there, I will go with you.
如果你去那里，我将和你一起去。
5. 条件句中用had
如原句为：
If they had listened to me, things would be different.
如果他们听了我的话，事情就不一样了。
当去掉了连词if时，之后要用倒装：
Had they listened to me, things would be different..
如原句为：
If we had arrived earlier, we would have caught the train.
如果我们早到的话，我们就赶上火车了。
当去掉了连词if时，之后要用倒装：
Had we arrived earlier, we would have caught the train..
用适当的词填空，使句意完整。
Little (1)______ we expect the misfortunes we would run into on our last holiday. Having travelled 28 hours across 3 different continents, we were finally relieved to arrive at our destination. We were looking forward to a hot bath, a meal and some rest. Yet, no sooner had we arrived at the gates of the hotel (2)______ we realised the hotel had shutdown. Not a light was to be seen on the hotel premises. We flagged down another taxi and set out to find alternative accommodation. We were besieged with yet more problems. Not (3)______ did the driver inform us that vacancies would be scarce, but if there were any, the cost would exorbitant. Despite this, no (4)______ were we going to allow these setbacks to defeat us...
Answers:
did (did follows the adverb little. it is past simple because it's a finished action)
than (than connects the two clauses in a 'no sooner' structure)
only (not only ... but also)
way (in no way structure)
参考来源：
https://ted-ielts.com/inversion/
https://www.learngrammar.net/english-grammar/inversion
https://www.buildingblocksenglish.com/post/inversion-in-the-use-of-english
