「It is + 被強調部分 + thatwho + 句子其他部分」是使用最廣的強調句型。除了謂語動詞不能強調外，句子中其它成分，如主語、狀語、賓語或賓語補足語都可以用該句型中加以強調。
A. 用強調結構強調句子成分
1．強調主語
被強調的主語是人時，可用It iswas ... thatwho ...，但如果被強調的部分既包括人又包括物，只能用that。
He bought a camera yesterday.
-- It was he thatwho bought a camera yesterday. 是他昨天買了一架照相機。
The famous writer and his works have aroused great interest among the students.
-- It is the famous writer and his works that have aroused great interest among the students. 在學生中引起極大的興趣的正是這位著名作家以及他的作品。
注意：
強調「I」時謂語動詞的變化形式。
It is I who am to blame.
It is me who is to blame. 是我該受到責怪。（非正式文體）
2. 強調賓語
She helped me yesterday.
--It was me thatwhom she helped yesterday. 昨天她幫助的人是我。
They often talk about the school and the teachers.
--It is the school and the teachers that they often talk about. 他們經常談論的是學校和老師。
3. 強調賓語補足語
We elected him chairman of the meeting.
-- It was chairman of the meeting that we elected him. 我們選他是做會議的主席。
We painted the wall white.
It was white that we painted the wall. 我們把牆漆成的是白色。
4. 強調狀語
英語中的狀語種類很多,一般都可以用It iswas ... that ...來強調。
①時間狀語
He left his hometown for Taiwan in his teens. 他十幾歲時就離開家鄉去了臺灣。
-- It was in his teens that he left his hometown for Taiwan. 他是在十幾歲時離開家鄉去臺灣的。
He let out the secret after the guest had gone away. 客人走後, 他說出了秘密。
-- It was after the guest had gone away that he let out the secret. 是在客人走後,他才說出了秘密。
提示
如果強調由not…until till 引導的時間狀語時，要注意否定前移。
He didn't return to his hometown until after liberation.
-- It was not until after liberation that he returned to his hometown. 他是解放後才回到他家鄉的。
②頻率狀語
He comes to see me once in a while.
-- It is once in a while that he comes to see me. 他現在是偶爾來看看我。
③地點狀語
The car accident happened in this street yesterday.
-- It was in this street that the car accident happened yesterday. 昨天就是在這條街上發生了汽車事故。
④方式狀語
They took care of their sick mother by turns.
-- It was by turns that they took care of their sick mother. 他們輪流來照看生病的母親。
⑤目的狀語
He got up early to catch the early bus.
--It was to catch the early bus that he got up early. 是為了趕早班車，他才起得很早的。
⑥原因狀語
They could not cross the river because the water had risen.
-- It was because the water had risen that they could not cross the river. 正是由於水漲了，他們沒有渡過河去。
提示：
在強調結構It iswas ...that ...中，要用because來引導原因狀語從句，不用since或as。（見第11章 狀語從句）
⑦其他狀語
The tailor made a suit to my own measure.
-- It was to my own measure that the tailor made a suit. 裁縫是按我自己的尺寸做了一套衣服。
⑧with without 複合結構
「with without+名詞代詞+其他成分」這種結構，也可以放在It iswas ... that 中，成為被強調的部分。
He was waiting for his son at the gate, with an umbrella in his hand.
-- It was with an umbrella in his hand that he was waiting for his son at the gate. 他是手裡拿著一把傘在門口等待著他的兒子。
She felt very nervous, with the teacher standing beside her.
It was with the teacher standing beside her that she felt very nervous. 是有老師站在她旁邊，她才感到很緊張的。
B．強調句與定語從句、狀語從句等其他句型的區別
有時強調句在形式上和定語從句、狀語從句很相似。我們除了從意思上進行區分外，還能根據強調句結構特點來進行判斷，如能去掉It was ...that ... 後，句子仍然通順，就是強調句。
It was at the railway station that we first met 16 years ago.
是在火車站我們16年前第一次相逢。（強調句，強調地點狀語at the railway station）
It was the railway station where we first met 16 years ago.
這是我們16年前第一次相逢的火車站。（定語從句，where 是關係副詞，在定語從句中做地點狀語）
It was in this street that the car accident happened the other day.
前幾天發生汽車事故的就是在這條街上。（強調句，強調地點狀語in this street）
It was this street where the car accident happened the other day.
這是前幾天汽車事故的那條街。（定語從句，where 是關係副詞在定語從句中做地點狀語）
It was at midnight that he got home yesterday.
他昨天是半夜到家的。（強調句，強調時間狀語at midnight）
It was midnight when he got home yesterday.
昨天他到家時已是半夜。（when引導的是時間狀語從句，it 是代詞，指時間）
C. 強調句的一般疑問句和特殊疑問句
1. 強調句的一般疑問句基本句型是：IsWas + it + that +句子其他成分？
Did he see you in the office just now？
-- Was it in the office that he saw you just now？他見你的地方是在辦公室嗎？
Does he often go to the library
Is it to the library that he often goes 他經常去的地方是圖書館嗎？
2. 強調句的特殊疑問句的基本句型是：特殊疑問詞+ iswas + it + that + 句子其他成分
When did you first go to the Great Wall？
-- When was it that you first went to the Great Wall？你究竟什麼時候第一次去長城的？
Where did you go last night
-- Who was it that told you about it 究竟是誰告訴你這件事的？
Why did you keep silent at the meeting？
Why was it that you kept silent at the meeting？你究竟為什麼在會上保持緘默？
3. 含有情態動詞強調句的疑問句結構：
① 一般疑問句基本句型是：情態動詞或助動詞+it+be+被強調的部分+that+句子其他成分？
Could he be killed at home 他是在家被殺的嗎？
--Could it be at home that he was killed 他被殺的地方會是在家裡嗎？
Might she leave her keys in the office 也許她把鑰匙丟在辦公室了
--Might ti be in the office that she left her keys？ 也許她把鑰匙丟在辦公室了
②特殊疑問句基本句型是：特殊疑問詞+情態動詞或助動詞+it+be+that+主語+句子其他成分
Where might the accident happen？
-- Where might it be that the accident happened？可能是在什麼地方發生這個事故的？
Who can it be in the office now？
-- Who can it be that is in the office now？現在還在辦公室裡的會是誰呢？
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（編輯：何瑩瑩）