Seldom did Michael go to the cinema.

Rarely does the temperature go above forty here.

Not only did he work faster, he worked better also.

No sooner had I reached the station than the train left.

②"only +状语"位于句首时，句子用部分倒装。如：

Only then did Phoebe realise the importance of it.

Only in this way can you improve the situation.

Only when she came home did her mother learn the news.

③当虚拟条件句中含有were, should, had时，可省略if，将were, should, had移到主语之前。如：

Were I you, I would invite Louise.

Should it rain tomorrow, we would cancel the meeting.

Had you come yesterday, you would have seen Dennis.

④as / though引导的让步状语从句常用于以下语序，即：adj. / adv. /分词/名词（不带冠词）/短语+ as +主语+谓语；v. + as +主语+助动词。如：

Difficult as it is, Justin decides to overcome it.

Much as I respected Lee, I can not agree him.

Praised as Sue was, she remained modest.

Child as Mary is, she is a gifted dancer.