强调句型的构成是：It is (was) + 被强调部分+ that (who) + 句子的其他成分。被强调的部分放在 It is (was) 之后，其它部分置于that之后。被强调部分可以是主语，宾语，表语或状语。强调的主语如果是人，可以由who代替that。*网
- 原句：Tom found my pen in the classroom yesterday.
- 强调主语：It was Tom who / that found my pen in the classroom yesterday.
- 强调宾语：It was my pen that Tom found in the classroom yesterday.
- 强调地点状语：It was in the classroom that Tom found my pen yesterday.
- 强调时间状语：It was yesterday that Tom found my pen in the classroom.
Was it Tom that found your pen in the classroom yesterday?
特殊疑问词+ is (was) it + that +句子的其他成分。特殊疑问词即是被强调的成分。如：
Who was it that found your pen in the classroom yesterday?
4.that (who) 有时可以省略：
It was my brother (that / whom) you saw the other day.
As she got up late, she missed the first bus. 变为：
It was because she got up late that she missed the bus.
He didn’t realize his mistake until the teacher had told him. 变为：
It wasn’t until the teacher had told him that he realized his mistake.
【注意】 在强调句式中，虽然not被提前，但not… until…句型不要倒装。
强调句型It is / was + 被强调的成份 + that + 其他成份；用来强调主语、宾语和状语等成份。that只起连接作用，不作成份，但不能省略。有时强调的部分比较特殊，如主语从句、状语从句、名词、不定式短语、V-ing的复合结构等。如：
It was in the library that I saw her yesterday. 我昨天正是在图书馆见到她的。
1.(2018·天津卷·单项填空)It was only when the car pulled up in front of our house ___________we saw Lily in the passenger seat.
A.which B. that
C.when D. where
2.(2016·天津卷·单项填空)You are waiting at a wrong place. It is at the hotel __________ the coach picks up tourists.
a.who B. which C. where D. that
【解析】句意：你在一个错误的地方等待。大客车是在旅店接送游客的。本题考查强调句，强调句型结构是：It is/was+强调部分+that+其余部分，如果强调部分是人，也可以用who，这句话强调的是地点状语at the hotel。故选D。
3.It was the culture, rather than the language, _________made it hard for him to adapt to the new environment abroad
A.where B. why C. that D. what
特殊疑问词 + is / was + it + that + 该句的其余部分。如：
How is it that you usually go to work? 你通常是怎样去上班的?
2.在强调not… until结构中由until所引导的短语(或从句)作时间状语时，要用固定的强调句型：It + is / was + not until… + that + 该句的其余部分，that所引导的从句中的谓语动词用肯定式。如：
His father didn’t come back from work until 12o’clock. = It was not until 12 o’clock that his father came home form work.
1.Bach died in 1750, but it was not until the early 19th century____ his musical gift was fully recognized.
A.while B. though C. that D. after
【解析】 句意：马赫死于1750年，但直到19世纪他的音乐天赋才被承认。强调句与not until 连用。It be not until that … 故选C项。
2.Was it because Jack came late for school ____________ Mr. Smith got angry?
A.why B. who C. where D. that
It was on March 1 that I had my hair cut. (强调句)
It was March 1 when I had my hair cut. (后面是定语从句)
判断是否是强调句，可采用还原法。如果还原为一般句式后，句子各种成份完整，则是强调句。否则不是。如第一句可还原成：I had my hair cut on March 1.
1.It’s not doing the things we like, but liking the things we have to do ＿＿＿ makes life happy.
A. that which
C.what D. who
2. It was with the help of the local guide ________ the mountain climber was rescued.
A. who B. that
C．when D. how
3. It was only after he had read the papers ________ Mr. Gross realized the task before him was extremely difficult to complete.
A. when that
C.which D. what
4.It was not until near the end of the letter ________ she mentioned her own plan.
A.that B. where
C. why D. when
5.It was ten o’clock _________ he came back home.
A.when B. that
C.since D. after
6.It was not until he came back _________ he knew the police were looking for him.
A.which B. since
C.that D. before
7.＂Was it under the tree ________ you were away talking to a friend?＂ ＂Sure. But when I got back there, the bike was gone.
A.that B. where
C.which D. while
8.It’s more than half a century ________ my grandfather joined the Party and became a servant to the people.
A.when B. that
C.since D. while
9.It was lack of money, not of effort, _____ defeated their plan.
A.which B. as
C. that D. when
When I look at this picture of myself, I realize of how fast time flies. I had grown not only physically, and also mentally in the past few years. About one month after this photo was took, I entered my second year of high school and become a new member of the school music club. Around me in picture are the things they were very important in my life at that time: car magazines and musical instruments. I enjoyed studying difference kinds of cars and planes, playing pop music, and collecting the late music albums. This picture often brings back to me many happy memories of your high school days.
1.（2016·天津卷·单项填空）It was when I got back to my apartment ___________ I first came across my new neighbors.
A.who B. where C. which D. that
2.（2016·上海卷·语法填空）But like so many other things, it is only too much stress (34) _______ does you harm.