It+be.。.that(who) 。..這一強調結構，這種強調結構用來突出強調句子的某一部分。該結構中的it (the emphatic it)，無詞匯意義，只用于改變句子的結構，使某一部分得以被強調。要正確使用這一結構應注意以下十個方面的問題：

　　1. 這種強調結構除了不能強調動詞外，其他成分如主語、賓語、賓補、狀語都可以強調。

　　例如： It was my sister who first had the idea to cycle along the Mekong River from

　　where it begins to where it ends.(強調主語)

　　It was in Greece that Olympic competitions firstly started.(強調狀語)

　　2. 被強調部分指人時用that，who均可，指事物或情況時用that(被強調的是時間或地點狀語時一般不用when，where)。

　　例： It was because of bad weather that the football match bad to be put off.

　　It was last year at the Olympics that Liu Xiang got the medal for hurdling race.是去年在奧運會上劉翔贏得了跨欄金牌。

　　2. 被強調的代詞格應與原句一致;被強調的部分如果是原句的主語，who(that)后的謂語在人稱和數上應與原句的主語一致。

　　例： It is Zhang Ziyi that (who) stars the film Heroes. 是章子儀主演的《英雄》這部電影。

　　It is him that I want to visit. 我想見的是他。

　　3. 如果強調雙賓語中的一個，不論是直接賓語還是間接賓語，根據動詞的搭配關系，要加上一個介詞to或for。

　　例：Mr. Green gave Mary a birthday present.→It was Mary that Mr. Green gave a birthday present to.

　　It was a birthday present that Mr. Green gave to Mary.

　　4. 如果原句是一般疑問句，強調結構用“be+it.。.that (who)。..?”形式;如果原句是特殊疑問句，則用“特殊疑問詞+be+it.。.that(who) 。..?”形式。

　　Is it an the end of 2001 that China joined WTO?

　　是2001年底中國加入了世貿組織嗎?

　　When was it that the tsunami struck the countries around the India Ocean? 是何時海嘯襲擊了印度洋沿岸各國?

　　5. 如果原句中含有“not.。.until”，在強調時間狀語時，將主句中的否定詞not連同狀語一期提前。

　　例： It was not until she took off her dark glasses that I realized she

　　was a famous film star.

　　6. 強調結構中的謂語動詞除用be外，還可以用might be 或must have been。

　　例：It might be tomorrow that she will come.

　　It must have been an actor that came yesterday.

　　7. 強調結構不但可獨立成句，也可用在從句中。

　　例： Further reading made me realize that it was hard work and determination as

　　well as her good nature that had got her into medical school.

　　8. 被強調部分句子可能較長或有一個以上的強調成分，對此就應注意識別。

　　例：It was not the fish but the vegetable， which grows only in Sichuan， that made the

　　hot dish sour and aromatic.

　　It was she who was lying in the corridor and the stranger who bent over her.是她躺在過道上，是那個陌生人俯視她。(此句有兩個被強調部分：一是she，一是 the stranger)

　　It is that intensity， along with the low cost and low risk， that causes the real

　　danger of cyber lover.

　　9. 強調結構中的時態一般應一致，即主句與從句中的時態應都用現在時，或都用將來時。

　　例： It was my two sisters who knew her best.(都用過去時)

　　It will not be you who will have to take the blame for this.(都用將來時)對此受譴責的將不是你。