【观察】观察下列几组句子中it的用法，然后加以总结。
1. a. It was for this very reason that Mr. Li came to work late this morning.
b. It was a professor from Peking University who / that gave us a speech yesterday.
2. a. It must be the naughty boys who are making so much noise.
b. It might have been at midnight that the traffic accident took place.
3. a. Is it in this factory that your father worked 20 years ago?
b. Was it on the bus that you had your cellphone stolen yesterday?
4. a. What is it that your boyfriend has bought you as a birthday present?
b. When and where was it that you met Jim for the first time?
5. a. It is simply because I like it that I do it.
b. It is what you do rather than what you say that matters.
6. a. I wonder what it is that has caused him to change his mind.
b. He asked me why it was that I hadn’t turned up at the party.
【总结】通过观察以上例句，可将it的用法归纳如下：
★ 强调句型的基本句式是“It is / was +被强调部分+ that / who +句子的其余部分”，它可以对句中除谓语动词以外的成分加以强调。被强调部分指人时，用who或that；指事物时用that。（如第1组例句）
★ 在强调结构中，be前可使用表示推测的情态动词。（如第2组例句）
★ 强调句型的一般疑问句形式是：Is / Was it +被强调部分+ that / who +句子的其余部分。（如第3组例句）
★ 强调句型的特殊疑问句形式是：疑问词+ is / was it that +句子的其余部分。（如第4组例句）
★ 强调句型也可强调状语从句、名词性从句等。（如第5组例句）
★ 强调句型的特殊疑问句形式还常出现在宾语从句中。（如第6组例句）
【拓展】
★ 强调主语时，谓语动词应与之保持一致。如：
It is I who am to go there together with you.
★ 如果被强调的是not ... until引导的时间状语（从句），用It is / was not until ... that ...结构。注意：此时not until不能分开。如：
It was not until I had finished all my homework that I went to bed last night.
★ 注意不要混淆强调句和定语从句：It is / was ... that ... 为强调句标志，去掉后仍可组成一个完整的句子；定语从句不具备这一特征。比较：
It was at ten o’clock that my husband got home last night.（强调句） = My husband got home last night at ten o’clock.
It was ten o’clock when my husband got home last night.（when引导定语从句）
I. 用强调句型改写下面划线部分所在句子/ 分句（对划线部分内容进行强调）。
We spend 36 minutes every day worrying, a study has revealed. ①Often the high cost of living and feeling out of shape are the causes. Researchers discovered that extreme anxiety means many people are unable to concentrate on their work and have to endure sleepless nights.
②It’s interesting that people care about gaining weight and petrol prices most of all. The survey found three in ten became depressed due to their worrying and ③one in ten admitted because of their worrying their relationship with their kids was affected.
1. __________________________________________________________________
2. ___________________________________________________________________
3. ___________________________________________________________________
II. 根据汉语意思运用强调结构补全下面句子。
1. 三个星期以后他才听到这个消息。
_________________________ he heard the news.
2. 他在会上说的话让我很生气。
_________________________ made me really angry.
3. 是彼得借钱给我们的。
_________________________ lent us the money.
4. 他们准备去的是西班牙，不是法国。
_________________________ they’re going to, not France.
5. 直到去年夏天我才接到她的来信。
_________________________ I heard from her.
6. 你昨天是在哪里碰到露西的？
_________________________ you met Lucy yesterday？
答案
I.
1. It is often the high cost of living and feeling out of shape that are the causes.
2. It’s interesting that it is gaining weight and petrol prices that people care about most of all.
3. one in ten admitted it was because of their worrying that their relationship with their kids was affected
II.
1. It was three weeks’ later that
2. It was what he said at the meeting that
3. It was Peter who / that
4. It’s Spain that
5. It was not until last summer that
6. Where was it that
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