scarcely，barely，rarely，in vain，little，never, not，not until，seldom, nowhere等.例
Hardly will you find such hospitable people in any other country.
In vain did he try to do it.
Little did he realize the danger he was in.
Not until then did I realize the danger of the situation.
类短语有at no time，in no way，in no sense，in no case，under no circumstances，in no
shape, at no point, by no means等.例如:
At no time was the President aware of what was happening.
In no way can theory be separated from practice.
On no account are visitors allowed to feed the animals.
Only when you have acquired a good knowledge of grammar can you write correctly.
Only by working hard can you expect to do well.
Only yesterday did he find out that his watch was missing.
4. Often, So(+adj.，adv. ), Well, Hence, Thus等开头的句子
Often did we ask for her not to be late for school.
So loudly did he speak that even people in the next room could hear him.
Some scientists believed that so fast does light travel that it is difficult for one to imag-
Well do I remember the day it happened.
S. Hardly had…when，Scarcely had.。.when，No sooner had…than…结构
......", hardly, scarcely, no sooner引导的主句通常用过去完成时，when, than引导的
Scarcely had they settled themselves in the seats in the theatre when the curtain went
No sooner had he closed his eyes than he fell asleep.
Hardly had I gone to bed when I heard someone knock at the door.
6. Many a/an或Not a+n.结构
Many a time has he given me good advice.
Not a hint，however，did he drop about it.
如果句子的谓语动词为趋向动词，如come, stand, lie, stretch, walk, go, sit等，主语
Behind him had come in a tall woman，of full figure and fine presence，with hair still
Under the tree was lying a half-conscious man who must have been drunk.