强调句型的基本句式是：It is / was + 被强调部分 + that + 句子的余下部分。它可以对句中除谓语以外的其它成分加以强调。如：
It was with the help of the local guide that the mountain climber was rescued.
(被强调的是方式状语with the help of the local guide)
It’s not doing the things we like, but liking the things we have to do that makes life happy.
如果被强调的是人，引导词that可用who / whom代替。如：
It is your husband who / that is to blame for the spoiled child.
It was my uncle whom / that we picked up at the airport yesterday.
如果被强调的是时间、地点、原因或方式状语，连接词用that，而不能误用when, where, why或how。如：
It was 80 years before Christopher Columbus crossed the Atlantic that Zheng He had sailed to East Africa.
Was it because Jack came late for school that Mr. Smith got angry?
强调句型的一般疑问句是“Is / Was it…who／that…?”结构。如：
—Was it by cutting down staff that she saved the firm?
—No, it was by improving work efficiency.
(被强调的是方式状语by cutting down staff)
强调句型的特殊疑问句只能强调疑问词，其基本句式是“疑问词 + is / was it that…?”结构。如：Why was it that you were absent from such an important meeting?
如果被强调的是not…until…引导的时间状语(从句)，用It is / was not until…that….结构。注意：此时not until不能分开。如：
It was not until near the end of the letter that she mentioned her own plan.
It was only after he had read the papers that Mr. Gross realized the task before him was extremely difficult to complete. (被强调的是after引导的时间状语从句)