1. 強調結構的陳述式

　　強調結構的陳述式為“It is (was) + 被強調部分 + that (who)…”。該結構可用于強調主語、賓語、狀語等，但不能強調謂語動詞。該句式中用that或who的區別是：當被強調的指人時，用that或who均可;當被強調的不是指人時，則只能用that(注意不用which)。如：It was in the office that he was killed. 他是辦公室被殺害的。(強調in the office)

　　It is the children who broke the window. 是孩子們打破窗戶的。(強調the children)

　　It was to you and not anyone else that I lent the money. 我只借錢給你，不借給其他人。(強調to you and not anyone)

　　It is only when you have your own children that you realize the troubles of parenthood. 當你有了自己的孩子，才能真切地了解到雙親的辛苦。(強調only when you have your own children)

　　2. 一般疑問句的強調結構

　　一般疑問句的強調結構就是將be提到句首，即使用“Is / Was it+ 被強調部分 + that / who…”。如：Is it Tommy who answered the telephone? 是湯米接的電話嗎? Is it from advertising that a newspaper earns a lot of its profits? 報紙獲利最多的部分是在于廣告收入嗎?

　　3. 特殊疑問句的強調結構

　　特殊疑問句的強調結構句型為“疑問詞(Who / What / When / Where / Why / How)+is / was it that…”這樣的形式。如：When was it that he got married? 他是什么時候結婚的? How long ago is it that you last saw her? 你上一次看見她是多久以前的事? Who was it that won the World Cup in 1982? 誰贏得了1982年的世界杯? Why is it that I always land up cleaning the bath? 為什么總是該我來洗刷浴缸? In which play of Shakespeare's is it that Viola appears? 維歐拉是在莎士比亞那個劇里出現的嗎?