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1)　句首为否定或半否定的词语，如no, not, never, seldom, little, hardly, at no time, in no way, not until… 等。

Never have I seen such a performance.

Nowhere will you find the answer to this question.

Not until the child fell asleep did the mother leave the room.

当Not until引出主从复合句，主句倒装，从句不倒装。

注意： 如否定词不在句首不倒装。

I have never seen such a performance.

The mother didn't leave the room until the child fell asleep.

典型例题

1)　Why can't I smoke here?

At no time___ in the meeting-room

A. is smoking permitted　　B.　smoking is permitted