六、as, though 引导的倒装句

as / though 引导的让步从句必须将表语或状语提前（形容词, 副词, 分词, 实义动词提前）。
注意：
1) 句首名词不能带任何冠词。
2) 句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
注意:
让步状语从句中，有 though ，although 时，后面的主句不能有 but ，但是 though 和 yet 可连用。

七、其他部分倒装

1) so… that 句型中的 so 位于句首时，需倒装。
So frightened was he that he did not dare to move an inch.
2) 在某些表示祝愿的句型中：
May you all be happy.
3) 在虚拟语气条件句中从句谓语动词有 were, had, should 等词，可将 if 省略，把 were, had, should 移到主语之前，采取部分倒装。
Were I you, I would try it again.
典型例题：
1）Not until the early years of the 19th century___ what heat is
A. man did know B. man knew C. didn't man know D. did man know
答案为 D. 否定词 Not 在句首，要求用部分倒装的句子结构。
2）Not until I began to work ___ how much time I had wasted.
A. didn't I realize B. did I realize C. I didn't realize D. I realize
答案为 B 。
3) Do you know Tom bought a new car?
I don't know, ___.
A. nor don't I care B. nor do I care
C. I don't care neither D. I don't care also
解析：答案为 B. 句中的 nor 引出部分倒装结构，表示 " 也不 " 。由 so, neither, nor 引导的倒装句，表示前一情况的重复出现。其中, so 用于肯定句, 而 neither, nor 用在否定句中。