1. 否定词放置句首时, 助动词或be 动词要放置主语的前面进行倒装. 常用的否定词有：not, scarcely, barely, seldom, not until, little, (in)under no circumstance, by no means, no sooner… than)。
　　Not until I reminded him for the third time _____ working and looked up.
　　　 A. that he stopped
　　　 B. does he stopped
　　　 C. did he stop
　　　 D. that he stopped
　　答案为C。
　　2．Only＋adv. 句子要倒装。
　　1）Only under such a condition will he make steady progress.
　　只有在这样的条件下，他才会取得扎实的进步。
　　3. nor, neither, so 用于句首时, 句子要倒装。
　　So little _____ about stock exchange that the lecture was completely beyond me.
　　　 A. did I know
　　　 B. I had known
　　　 C. I knew
　　　 D. was I know
　　答案为A。
　　4. 虚拟条件句中省略if时要倒装。
　　_____ you were busy, I wouldn't have bothered you with my questions.
　　　 A. If I realized
　　　 B. Had I realized
　　　 C. Did I have realized that
　　　 D. As I realized
　　答案为B。