Who was it that broke the window？打破窗子的是谁？

When was it that you called me yesterday?

你昨天是什么时候打电话给我的？

What is it that you want me to do？你要我做的是什么？

How was it that you succeeded？你是怎么成功的？

Why is it that smoking is not allowed here?

这儿为什么不允许吸烟？

Where was it that he bought the bike?

他是在什么地方买到这辆自行车的？

5．有时可用It might be...that...，It must have been...that...句型表示强调。

It might be his father that you're thinking of.

你关心的可能是他父亲。

It must have been his brother that you saw.

你看到的想必是他的兄弟。

6．在现代英语中，that/whom可省略

Was it in Nanjing(that)you first met him?

你是在南京第一次碰到他的吗？

It was my mother(whom)you saw the other day.

你几天前见到的是我妈妈。

7．这一强调句型可用于原因状语从句，当原因状语从句是as，since引导时，应改为because引导，但结果状语从句、条件状语从句、让步状语从句等不能用于这一强调句型

She missed the first bus since she got up late.

→It was because she got up late that she missed the first bus.她因起晚了而误了第一班车。

8．使用这一强调句型时，需注意否定转移

Money can't buy everything.

→It is not everything that money can buy.

钱不能买到一切。

He didn't go to bed until twelve o'clock last night.

→It was not until twelve o'clock last night that he went to bed.昨晚他12点才去睡觉。

I didn't realize it until I got off the bus.

→It was not until I got off the bus that I realized it.

直到下车我才意识到这一点。

9．用这一强调句型时，要注意以下几点

(1)不论强调句子的哪一部分，都可用that连接句子的其余部分。

(2)被强调部分指人时，可用who取代that；指物时，有时可用which取代that。

(3)如果被强调部分指人，并且作后面句中的宾语时，也可用whom代替who。

(4)that，who等常常被省略掉，特别是在口语中，在强调直接宾语或间接宾语、时间或地点状语时。

(5)如果被强调的主语为人称代词时，可用主格，也可用宾格形式。

(6)被强调部分通常不能用不定代词，除非其后还有定语。

(7)如果被强调部分在后面的句子中为定语时，要用whose引导后面的句子。

(8)在强调介词宾语时，介词常置于whom等之前(介词＋whom)，但也可把介词