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It 句型主要有三个方面：
1. it 引导的强调句型；
2. it 作形式主语或者形式宾语；
3. it 和 since, before, when 等连用。
为了提高同学们的应变能力，现对 it 引导的一些常见句型归纳总结如下：
用 被强调成分是“人”时，连词用 that 或 who 都可以，否则，只能用 that ，而且， be 动词只能用 is 或 was 两种形式。
例 It was two years ago that he made an important invention. （原句是： He made an important invention two years ago. ）就是在两年之前，他做出了一项重要的发明。
It was at 6 o ' clock that he practiced playing the violin in the morning. （原句是： He practiced playing the violin at 6 o ' clock in the morning. ）他早上六点钟的时候练习拉小提琴。
辨 It was 6 o ' clock when he began to practice playing the violin in the morning. （早上他开始练习拉小提琴时是在六点钟）这是含有状语从句的复合句，而非强调句型， it 指时间， it was 6 o ' clock. 即“六点钟了。”
拓 在 not … until …句型中，强调 until 引导的状语从句时，用 It is/was not until+ 被强调成分 +that-clause 结构。如：
I didn ' t realize she was a famous film star until she took off her dark glasses. 直到她摘下墨镜我才意识到她是一位著名的电影明星。
变为强调句即： It was not until she took off her dark glasses that I realized she was a famous film star.
考 It was not until near the end of the letter ______ she mentioned her own plan. （天津高考）
A. that
B. where
C. why
D. when
选 A 。此处考查固定句型 not … until …的强调句，其句型结构应为： It is/was not until … that+ 句子，故本题应选 A 。
用 此句型中 it 是形式主语，真正的主语是后面的动词不定式。
例 It took me three hours to finish my homework. 我花了三个小时才完成作业。
用 此句型中 it 是形式主语，真正的主语是后面的动词不定式。
例 It ' s important for us to have a good command of English. 掌握好英语对我们来说是重要的。
It ' s kind of him to put us up for the night. 他为我们提供住宿，真是太好了。
用 此句型中 it 是形式主语，真正的主语是后面 that 引导的从句，即主语从句。
例 It is said that he is studying abroad. 据说他正在国外留学。
拓 此句型可以用下面的形式表达相同的意思：
Sb. is said/thought/hoped/believed to do sth …（注意： suggest 不适用于这种转换）
It is said that he is studying abroad.=He is said to be studying abroad.
用 此句型中 it 是形式宾语，真正的宾语是后面的不定式。
例 I feel it foolish of him to believe such a man. 我觉得他太傻了，竟然相信这样的人。
The timely rain had made it possible for the crops to grow well. 这场及时雨使得庄稼可以很好地生长。
考 No matter where he is, he makes ______ a rule to go for a walk before breakfast. （陕西高考）
A. him
B. this
C. that
D. it
选 D 。句意：无论在哪儿，早餐之前散散步都是他的老规矩。由句意可知 to go for a walk before breakfast 是真正宾语， a rule 为宾补，故此处需用 it 充当形式宾语。
用 “ It was (not)+ 时间段 +before+ 一般过去时”意为“过了一段时间才……；没过多久就……”；“ It will (not) be+ 时间段 +before+ 一般现在时”意为“多久才……；不久就……”。
例 It was not long before she learned those poems by heart. 她没过多久就背会了那些诗歌。
It was long before the police arrived. 过了很久警察才来。
It will be hours before he makes a decision. 要过好几个小时他才会做出决定。
It will not be hours before we meet again. 要不了几个小时我们还会再见面的。
考 John thinks it won ' t be long ______ he is ready for his new job. （湖南高考）
A. when
B. after
C. before
D. since
选 C 。句意：约翰认为不久他就能为他的新工作做好准备。所填词引导状语从句，构成 It will not be+ 时间段 +before 状语从句，意思是“用不了多久就……”。
用 该句型中 since 从句的谓语动词需使用一般过去时。
例 It is three years since I last saw you. 自从我上次见到你到现在已经三年了。
考 As is reported, it is 100 years ______ Tsinghua University was founded. （四川高考）
A. when
B. before
C. after
D. since
选 D 。句意：据报道，自从清华大学建校以来到现在已经有一百年了。此处需用 It is … ince …句型，表示“自从……已经有……”，故本题选 D 。
用 如果要具体说明该某人做某事的时候了，可以用 It ' s time for sb. to do sth.
例 It ' s time for us to leave. 到了我们该走的时候了。
例 It ' s your turn to answer the question. 轮到你回答问题了。
例 It ' s no use waiting here. Let ' s go home. 在这儿等着也没用，我们回家吧。
1.Most young people find ______ exciting to watch a football match.
A. that
B. this
C. it
D. one
2.With housing price going up constantly, more and more working families find ______ difficult to afford a comfortable apartment.
A. that
B. it
C. them
D. this
3. — ______ he managed to solve the problem?
— Oh, he turned to Professor Lee for advice.
A. Was it how that
B. Was it that how
C. How was it that
D. How it was that
4.The question is too difficult and we found ______.
A. it not easy to answer it
B. it was not easy for us to answer it
C. it ' s not easy to answer
D. it not easy to answer
5.It was not until last year ______ he got in touch with his father in Canada.
A. where
B. what
C. how
D. that
6. — What was the party like?
— Wonderful. It ' s years ______ I enjoyed myself so much.
A. after
B. when
C. before
D. since
7.We have made ______ clear that we are strongly against smoking in the office.
A. this
B. that
C. it
D. one
8.It was only after he had read the papers ______ Mr. Gross realized the task was very hard to complete.
A. when
B. that
C. which
D. what
9.Someone called me up in the middle of the night, but they hung up ______ I could answer the phone.
A. as B. since C. until D. before
10.______ seemed that she was out as no one answered my phone.
A. That
B. What
C. It
D. She
11.It was quite a long time ______ I figured out what had happened to the manager.
A. after
B. before
C. when
D. since
12.It ' s time ______ lunch. We should go to the dining room now.
A. in
B. with
C. for
D. on
13.I don ' t think ______ possible to master a foreign language without much memory work.
A. this
B. that
C. its
D. it
14.It ' s no use ______. We should try our best to find the right solutions.
A. to complain
B. complains
C. of complaining
D. complaining
15.Today is Friday. It ' s my ______ to clean the room.
A. turn
B. work
C. way
D. week
01-05 CBCDD
06-10 DCBDC
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