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常考的強調句結構是it 引導的句子。
It is (was) 被強調部分+ that (who) + 句子其他部分。
此結構強調的成分僅限於主語，賓語和狀語。
It is from the sun that we get light and heat.
It was not until I had read your letter that I understood the true state of affairs.
典型例題
1) It was last night ___ I see the comet.
A. the time B. when C. that D. which
答案C. 強調句的結構是： It +be +強調部分 + that (who) + 主謂句。 強調句的連詞只有兩個，that和who。當強調的部分是人，且為句子的主語時，才用 "who"，其餘用that。
原句： My father did the experiment in the lab yesterday evening.
強調主語： It was my father who did the experiment in the lab yesterday evening.
強調賓語： It was the experiment that my father did in the lab yesterday evening.
強調時間： It was yesterday evening that my father did the experiment in the lab. (注意不用when)
強調地點： It was in the lab that my father did the experiment yesterday evening.
2)It is ten years ___ Miss Green returned to Canada.
A. that B. when C. since D. as
答案C. 考點是連詞用法。 本題易誤選為A. that. 其實本句不是強調句。若是，去掉It be… that還應是一個完整的句子。而本句去掉 'It is…that'，只剩下ten years Miss Green returned to Canada. 不成句。因此本句不是強調句。
It is /was +時間+ since… 其中is<---> has been was <---> had been.
結構分析
強調結構中的it is (was)…that (who)…為使一個非強調句變成強調句的結構詞，在通常情況下，去掉它，句子依然是成立的——這是判斷一個句子是否為強調結構的重要標誌。如下面這個句子是強調句，因為去掉it was…that…後句子依然成立，且意思一致：
It was my mother who finally called the police. 最終報警的是我母親。
→My mother finally called the police. 最終報警的是我母親。
請看下面一句，空白處是填that還是其他的什麼詞?
It was ten o'clock _______ he returned home.
此處不能填that，因為若填that把它視為強調句，那麼就可以去掉it was…that…而使句子結構完整，意思不變，事實上並非如此，因為我們是不能說Ten o'clock he returned home的，除非改為At ten o'clock he returned home才是正確的。
比較下面兩句(第1句不是強調句，但第2句是強調句)：
It was ten o'clock when he returned home. 他回家的`時候已是10點鐘了。
It was at ten o'clock that he returned home. 他是10點鐘回家的。
二、時態一致問題
一般說來，強調結構it be…that…中的be的時態應與句子時態一致，即同時用現在時，或同時用過去時，有時也可能用將來時。如：
It is not I who am angry. 發怒的不是我。(同時用現在時)
It was my two sisters who knew her best. 是我的兩個姐妹最瞭解她。(同時用過去時)
It will not be you who will have to take the blame for this. 對此須受責難的將不是你。(同時用將來時)
但有時也可以不一致，這主要見於強調結構用it is…that…(即用的是現在時)，而句子用的是過去時。如：
It is Miss Williams who enjoyed reading novels as a pastime. 是威廉姆斯小姐以讀小說來消遣。
