1.强调结构的陈述式

强调结构的陈述式为“It is (was) + 被强调部分 + that (who)…”。该结构可用于强调主语、宾语、状语等，但不能强调谓语动词。该句式中用that或who的区别是：当被强调的指人时，用that或who均可;当被强调的不是指人时，则只能用that(注意不用which)。如：

It was in the office that he was killed. 他是办公室被杀害的。(强调in the office)

It is the children who broke the window. 是孩子们打破窗户的。(强调the children)

It was to you and not anyone else that I lent the money. 我只借钱给你，不借给其他人。(强调to you and not anyone)

It is only when you have your own children that you realize the troubles of parenthood. 当你有了自己的孩子，才能真切地了解到双亲的辛苦。(强调only when you have your own children)

2. 一般疑问句的强调结构

一般疑问句的强调结构就是将be提到句首，即使用“Is / Was it+ 被强调部分 + that / who…”。如：

Is it Tommy who answered the telephone? 是汤米接的电话吗?

Is it from advertising that a newspaper earns a lot of its profits? 报纸获利最多的部分是在于广告收入吗?

3. 特殊疑问句的强调结构

特殊疑问句的强调结构句型为“疑问词(Who / What / When / Where / Why / How)+is / was it that…”这样的形式。如：

When was it that he got married? 他是什么时候结婚的?

How long ago is it that you last saw her? 你上一次看见她是多久以前的事?

Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯?

Why is it that I always land up cleaning the bath? 为什么总是该我来洗刷浴缸?

In which play of Shakespeare’s is it that Viola appears? 维欧拉是在莎士比亚那个剧里出现的吗?