當需要強調句中的主語、賓語、狀語時，我們常用“It is(was) 被強調部分 that(who)”這種句型，使用此句型時，應注意以下幾點。

　　1.一般情況用It is(was)……that…如：

　　He read three books in the library yesterday.

　　我們分別可以強調主語、賓語、地點狀語和時間狀語。如：

　　It was he who(that)read three books in the library yesterday.(強調主語)

　　It was three books that he read in the library yesterday.(強調賓語)

　　It was in the library that he read three books yesterday.(強調時間狀語)

　　2.當被強調部分指人時，可用that，也可用who；指物時，只用what,如：

　　It was Tom who(that)I met last week.

　　It is a new boke that his brother wants to buy.

　　3.強調狀語時，只用that,不用when、where.如：

　　It is at 5 o"clock that the train will arrive.

　　4.被強調的部分是主語時，注意句子的謂語動詞和被強調的主語保持一致。如：

　　It is he who is late. 　It is they that were late.

　　5.一般疑問句的強調句為“Is (was) it that…?”；特殊疑問句為：“特殊疑問詞 is (was) that…?”結構。如：

　　Was it ten years ago that his father died?（他的父親是十年前去世的嗎？）

　　When is it that you will set off?（你到底什麼時候出發？）

　　6.“not…until…”句型的強調結構為“It is not until…that…”應注意把否定詞not轉移到until前面。如：I didn"t go home until rain stopped.(直到雨停了我才回家)。

　　強調句為：It was not until rain stopped that I went home.

　　I didn"t know the news until yesterday.(直到昨天我才知道那個訊息)

　　強調句為：It was not until yesterday that I knew the news.