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英语半倒装句的结构
说具体点吧:
1.only+状语
Only in this way can you learn English well.
2.否定副词开头或含有否定词的介词短语开头
Never have I seen such a strange man!
3.so+形容词或副词开头或类似以such开头的
So frightened she was that she couldn't say a word.
4.介副词开头的表语或表语从句
The door opened. In came his father.
5.if引导的虚拟条件从句省略if时
Had I known his name, I would have told you.
6.as作让步状语的特殊结构
Young as he is, he is experienced.
7.so,nor,neither开头表示情况相同:
I like watching movies. So does my brother.
英语语法中前置和倒装的区别
否定，一般有两种：否定谓语动词；用否定词汇，像否定代词，否定副词
倒装，也分两种；一是部分倒装，把句子的谓语一部分放到主语前面。一是全部倒装，是把句子谓语的全部放到主语的前面。
否定倒装句neither和nor的区别
一、英语倒装句是个特殊的句型，在含有否定副词的句子当中，如never, seldom, rarely, little, hardly, scarcely, no sooner, no longer, nowhere 等这些含有否定意义的副词位于句首时，则其后要用部分倒装，例如：I shall never tell him. / Never shall I tell him. 我永远不会告诉他。He seldom does work at home. / Seldom does he do work at home. 他很少在家工作。She hardly has time to have a cup of tea with her friends. / Hardly does she have time to have a cup of tea with her friends. 她几乎没时间和她朋友一起喝茶。He little realizes how important this meeting is. / Little does he realize how important this meeting is. 他不明白这个会议的重要性。We had no sooner reached the airport than the plane took off. / No sooner had we reached the airport than the plane took off. 我们刚到机场,飞机就起飞了。
二、(1) 对于not…until句型，当not until…位于句首时，其后的主句要用倒装语序：He didn’t leave the room until the rain stopped. / Not until the rain stopped did he leave the room. 雨停了之后他才离开这房间。
(2) 某些起副词作用的介词短语，由于含有否定词，若位于句首，其后要用部分倒装：On no accounts must this switch be touched. 这个开关是绝不能触摸的。In [Under] no circumstances will I lend the book to him.无论如何我也不会再借书给他了。但是，in no time(立即，马上)位于句首时，其后无需用倒装语序：In no time he make the decision to help his sister.他马上就决定帮助他的妹妹。
三、一般来说，英语倒装句是一种语法手段，英语表示一定的句子结构和强调某一句子成分，在我们平常的日常英语学习中，一定要注意积累英语倒装句的用法，在英语写作当中，也可以尝试运用倒装句，这样对你的写作分值会有所提高。
以否定词开头的句子要部分倒装句吗
当句子以具有否定意义的词开头时，
1. 在be的一般现在时am、is、are和一般过去时was、were作主系表结构句的系动词的情形，直接把be动词的相应形式搬到主语之前形成（事实上的完全）倒装句。例如：
He is never late for school.---> Never is he late for school.(他上学从不迟到。)
She was seldom happy at the time.---> Seldom was she happy at the time.(她那时很少开心过。)
2. 除了1中所述的两种情形，其它所有情形都是部分倒装，即把助动词或情态动词放到主语前面去。
①一般行为动词作谓语时
He never worked here.--->Never did he work here.（他从未在这儿工作过。）（改成倒装句时，由于增加了助动词did，原来的worked必须用原形动词work！）
We should never trust the enemy--->Never should we trust the enemy.（我们永远都不要相信敌人。）
John has hardly been trusted before.---> Hardly has John been trusted before.(以前约翰几乎没被信任过。)
If I had known that, I would never have told the truth.---> Never would I have told the truth if I had known that.(我要是早知道这样，我就永远不会说出真相！)
② 对于系动词be的非一般现在时和非一般过去时，也是要部分倒装的！例如：
I shall never be anyone else.---> Never shall I be anyone else.(我永远都不会成为其他任何人。)
They could never be in such a difficult condition.--->Never could they be in such a difficult condition.(他们永远都不会处于这么困难的环境里。)
③对于半情态动词have/has to与其它动词构成句子谓语的情形，若句子以具有否定意义的词开头，在主语前增加助动词do/does形成部分倒装。例如：
I seldom have to obey anyone's order.---> Seldom do I have to obey anyone's order.(我很少不得不听从别人的命令。)
John hardly has to work on weekends.---Hardly does John have to work on weekends.(约翰几乎不用被迫在周末工作。)
注：当have to前有其它助动词或情态动词时，当然要遵守一般部分倒装的规则，即把助动词或情态动词提前到主语前面：
I will never have to do that.--->Never will I have to do that.(我将永远都不需要那么做。)
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