“It is + 被强调部分 + thatwho + 句子其他部分”是使用最广的强调句型。除了谓语动词不能强调外，句子中其它成分，如主语、状语、宾语或宾语补足语都可以用该句型中加以强调。
A. 用强调结构强调句子成分
1．强调主语
被强调的主语是人时，可用It iswas ... thatwho ...，但如果被强调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. 是他昨天买了一架照相机。
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. 在学生中引起极大的兴趣的正是这位著名作家以及他的作品。
注意：
强调“I”时谓语动词的变化形式。
It is I who am to blame.
It is me who is to blame. 是我该受到责怪。（非正式文体）
2. 强调宾语
She helped me yesterday.
--It was me thatwhom she helped yesterday. 昨天她帮助的人是我。
They often talk about the school and the teachers.
--It is the school and the teachers that they often talk about. 他们经常谈论的是学校和老师。
3. 强调宾语补足语
We elected him chairman of the meeting.
-- It was chairman of the meeting that we elected him. 我们选他是做会议的主席。
We painted the wall white.
It was white that we painted the wall. 我们把墙漆成的是白色。
4. 强调状语
英语中的状语种类很多,一般都可以用It iswas ... that ...来强调。
①时间状语
He left his hometown for Taiwan in his teens. 他十几岁时就离开家乡去了台湾。
-- It was in his teens that he left his hometown for Taiwan. 他是在十几岁时离开家乡去台湾的。
He let out the secret after the guest had gone away. 客人走后, 他说出了秘密。
-- It was after the guest had gone away that he let out the secret. 是在客人走后,他才说出了秘密。
提示
如果强调由not…until till 引导的时间状语时，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. 他是解放后才回到他家乡的。
②频率状语
He comes to see me once in a while.
-- It is once in a while that he comes to see me. 他现在是偶尔来看看我。
③地点状语
The car accident happened in this street yesterday.
-- It was in this street that the car accident happened yesterday. 昨天就是在这条街上发生了汽车事故。
④方式状语
They took care of their sick mother by turns.
-- It was by turns that they took care of their sick mother. 他们轮流来照看生病的母亲。
⑤目的状语
He got up early to catch the early bus.
--It was to catch the early bus that he got up early. 是为了赶早班车，他才起得很早的。
⑥原因状语
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. 正是由于水涨了，他们没有渡过河去。
提示：
在强调结构It iswas ...that ...中，要用because来引导原因状语从句，不用since或as。（见第11章 状语从句）
⑦其他状语
The tailor made a suit to my own measure.
-- It was to my own measure that the tailor made a suit. 裁缝是按我自己的尺寸做了一套衣服。
⑧with without 复合结构
“with without+名词代词+其他成分”这种结构，也可以放在It iswas ... that 中，成为被强调的部分。
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. 他是手里拿着一把伞在门口等待着他的儿子。
She felt very nervous, with the teacher standing beside her.
It was with the teacher standing beside her that she felt very nervous. 是有老师站在她旁边，她才感到很紧张的。
B．强调句与定语从句、状语从句等其他句型的区别
有时强调句在形式上和定语从句、状语从句很相似。我们除了从意思上进行区分外，还能根据强调句结构特点来进行判断，如能去掉It was ...that ... 后，句子仍然通顺，就是强调句。
It was at the railway station that we first met 16 years ago.
是在火车站我们16年前第一次相逢。（强调句，强调地点状语at the railway station）
It was the railway station where we first met 16 years ago.
这是我们16年前第一次相逢的火车站。（定语从句，where 是关系副词，在定语从句中做地点状语）
It was in this street that the car accident happened the other day.
前几天发生汽车事故的就是在这条街上。（强调句，强调地点状语in this street）
It was this street where the car accident happened the other day.
这是前几天汽车事故的那条街。（定语从句，where 是关系副词在定语从句中做地点状语）
It was at midnight that he got home yesterday.
他昨天是半夜到家的。（强调句，强调时间状语at midnight）
It was midnight when he got home yesterday.
昨天他到家时已是半夜。（when引导的是时间状语从句，it 是代词，指时间）
C. 强调句的一般疑问句和特殊疑问句
1. 强调句的一般疑问句基本句型是：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？他见你的地方是在办公室吗？
Does he often go to the library
Is it to the library that he often goes 他经常去的地方是图书馆吗？
2. 强调句的特殊疑问句的基本句型是：特殊疑问词+ 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？你究竟什么时候第一次去长城的？
Where did you go last night
-- Who was it that told you about it 究竟是谁告诉你这件事的？
Why did you keep silent at the meeting？
Why was it that you kept silent at the meeting？你究竟为什么在会上保持缄默？
3. 含有情态动词强调句的疑问句结构：
① 一般疑问句基本句型是：情态动词或助动词+it+be+被强调的部分+that+句子其他成分？
Could he be killed at home 他是在家被杀的吗？
--Could it be at home that he was killed 他被杀的地方会是在家里吗？
Might she leave her keys in the office 也许她把钥匙丢在办公室了
--Might ti be in the office that she left her keys？ 也许她把钥匙丢在办公室了
②特殊疑问句基本句型是：特殊疑问词+情态动词或助动词+it+be+that+主语+句子其他成分
Where might the accident happen？
-- Where might it be that the accident happened？可能是在什么地方发生这个事故的？
Who can it be in the office now？
-- Who can it be that is in the office now？现在还在办公室里的会是谁呢？
