这类词或短语主要有never, neither, nor, little, seldom, rarely, hardly, scarcely, no sooner, not only, in no way, at no time, few, not, no等，如：
Never have I found him so happy.
Little does he care about what I said.
2. only + 状语放在句首
Only in this way can we realize our dream.(介词短语)
Only then did I realize the importance of math.(副词)
3. so + 形容词或副词放在句首
So busy is he that he has no time to write a letter.
So cold was the weather that we had to stay at home.
4. not until放在句首，从句不倒装，主句部分倒装
Not until the teacher came in did the students stop talking.
Not until my son had entered the university did he realize the importance of time.(复合句)
5. 为了避免重复，使用so, neither, nor放于句首引起一个句子，表示前面所提及的情况也适合于另一人或事物时
If he goes there, so will I.
I have never been to Beijing. Neither/Nor has my brother.
— Jim is a good-swimmer. Jim是个游泳健将。
— So he is, and so is Dick. 他的确是。Dick也是。
______ that he would fulfill his task so rapidly.
A. Never believe B. Little did we expect
C. Seldom could he D. Scarcely do we think
【答案】B。解析：考查倒装。句意：我们一点也没料到他这么快就完成任务了。含有否定意义的词(如never, seldom, rarely, little, hardly, scarcely, no sooner, no longer, nowhere等)位于句首时需要倒装。题干还原成正常语序就是We expected little that he would fulfill his task so rapidly. A项缺少主语，C项缺少谓语，D项意思不符合语境。故正确答案为B。