否定意义的副词或短语放在句首，句子半倒装。这样的副词主要有：little, seldom, hardly, rarely, scarcely, never, not at all, by no means(决不), at no time(在任何时候都不)，nowhere, in no case (无论如何都不);not in the least (=not at all) , on no condition(决不) 等。
Never shall I forget you.
At no time was the man aware of what was happening. 那个人根本没有注意到发生的情况。
Little did I understand what he said to me at that time. 我那时几乎没有明白他给我说的话。
Its beyond description. Nowhere else in the world can there be such a quiet, beautiful place.
Not a single mistake did he make in the exam. 他在考试中没有犯一个错误。
By no means are these works of art satisfactory. 这些艺术品根本不能令人满意。
On no condition should you visit that place. 你决不能去那个地方。
句型21 半倒装句(二) not only…, but also…(前一分句倒装，后一分句不倒装)
Not only was everything he had taken away from him, but also his German citizenship was taken away. 不仅他拥有的一切被那走了，就连他的德国国籍也被取消了。
They suggested not only should we attend the party but also give a performance. 他们建议我们不仅要参加晚会，还要进行表演。
Not only should we students study hard, we also should know how to enjoy ourselves in our spare time. 我们学生不仅要学习好，还应该知道在课余时间怎样享受生活。
句型22 半倒装句(三) neither, nor放在句首
If you dont go to see the movie, neither will I. 如果你不去看电影，我也不去。
--Why didnt you buy the jacket?
--Neither was the price satisfactory, nor did the color agree with me.
I dont like him, nor do I care about him. 我不喜欢他，也不关心他。
句型23 半倒装句(四) "only + 状语"放在句首，句子半倒装
Only when the war was over did he return to work. 直到战争结束他才回去工作。
Only after you have reached eighteen can you join the army. 你只有到了18岁才能参军。
Only in that way will we be ready for the challenges and opportunities in life.
Only by changing the way we live will we be able to save the earth.
Only in this way can you work out the problem. 你只有用这种方法才能做出题目。
Only this way can help you work out the problem. 只有这种方法才能帮你做出题目。
so + be动词/助动词/情态动词等 + 主语 "……也……"(表示肯定意思)
neither/nor +动词/助动词/情态动词等 + 主语 "……也……"(表示否定意思)
She is interested in the story, so am I.
He enjoys playing the guitar, so do I.
I saw the film last night, so did he.
In the past 20 years, our society has changed a lot, so have our eating habits.
Tom didnt attend the meeting last night; nor did Mary. Tom没来参加昨晚的会议，Mary也没来。
I have never been abroad. Neither/Nor has Tom.
[比较1] "so + 主语 + 助动词" 表示肯定已有的观点或事实
-We have all worked hard these days.
-So we have.(的确如此)
I promised to help him, and so I did.(我确实帮助他了)
[比较2] "主语 + 助动词 + so" 表示按照别人的要求去做
The wounded little boy asked me to lift him up and I did so.
The doctor asked Charlie to breathe deeply and he did so.