Unit 4 Global warming 一轮复习第二课时

Module 6 unit 4 第二课时
it的用法（2）
it用于强调句型
【基础过关】
1、如果强调句型指现在或未来情况用It is，指过去情况用It was。
2、被强调部分往往是句子的主语、宾语、时间状语和地点状语，但有时也可强调比较复杂的内容，如时间状语从句、条件状语从句、not until...、not only...but also...、...as well as...等结构。
3、被强调部分是人称代词时，原句用什么格，强调句也用什么格。
4、被强调部分如果是主格人称代词时，who/that后的动词应和该主格人称代词在人称和数上保持一致。
5、关于强调词的选用，强调人时可用who或that；如果不强调人一律用that。此时绝不能和定语从句混淆，被强调部分为时间状语、地点状语或者原因状语时不能误用when、where或why。
It was him who/that I saw the day before yesterday.
6、强调句型的一般疑问句结构为：Is /Was it…who／that…?
Was it during the Second World War that he died？
7、强调句型的特殊疑问句结构为：特殊疑问词＋is /was it that…?(强调句型的特殊疑问句只能强调特殊疑问词)
Where was it that you found your lost pen？
8、强调句型中的is /was前面可用must /may /might等表推测的情态动词。
It might be in this room that he met her.
9、被强调部分为时间状语和地点状语时，有可能先接定语从句，再接强调句型，应多加思考，不能混用。
It was on October 1st,1949when he joined the Party that he was killed.
10、判断强调句型的使用是否正确的方法是将强调结构去掉，如果去掉强调结构后的句子仍然正确，强调句型就正确，否则就不正确。
It was six years ago that he went to Tokyo.
【点拨】该句强调句型使用正确，因为去掉强调结构后，该句仍然是一正确句子。即：Six years ago he went to Tokyo.
【拓展延伸】　强调谓语句式
强调谓语一般用助动词does/do/did+动词原形。例如：
He does take ages to dress.
他确实是穿衣要用好长时间。
【点拨】强调谓语时句子的时态一般是一般现在时和一般过去时。
【典型例题】
1. It was_____back home after the experiment.
A. not until midnight did he go B. until midnight that he didn’t go
C. not until midnight that he went D. until midnight when he didn’t go
【答案】C。考查not ---until 句型的强调句。
【点拨】not…until 句型变为强调结构时，不用when引导，要用that 引导，that后的从句用陈述语序。此句的正常语序为：He didn’t go back home until midnight after the experiment.此句的倒装句为：Not until midnight did he go back home after the experiment.
2. I have always been honest and straightforward, and it doesn’t matter ______ I’m talking to. A. who is it????? B. who it is????? C. it is who??????? D. it is whom
【答案】B。此题考查强调结构的特殊疑问句句式。
【点拨】特殊疑问词＋is/was+that+其他部分。
it用于名词性从句
1. It is/was well-known that…众所周知。
It is well-known that the Great Wall is the longest wall in the world.
众所周知，长城是世界上最长的墙。
【点拨】 在这个句型中，that引导的是主语从句，此句型可以转换为as引导的定语从句， It is/was well-known that…相当于as we all know。
【举一反三】常见的结构有：It is hoped that… 人们希望；It is said that…据说；
It is reported that… 据报道； It is believed that…人们相信。例如：
It is reported that that singer has been in prison for one year.
据报道，那位歌星曾经坐过一年监。
【典型例题】
_________is known to everybody, the moon travels round the earth once every month.
A. It B. As C. That D. What
【答案】B 考查as引导非限制性定语从句。
【点拨】本句中间有逗号，所以不能选A。
【实战演练】
My spelling book is missing. I can’t remember where I put __________.
A. it B. this C. that D. them
—Who’s knocking at the door?
___________.
A. I’m John. B. John is me. C. John is the man. D. It’s John.
— What date is it today?
—______ is the eighth of March today.
A. The date B. Their C. Today D. It
It is ________ who ____________ wrong.
A. me; me B. me; is C. I; am D. I; is
It was _____ late in the evening that her husband arrived home.
A. after B. when C. till D. not until
– Was that the new school master who walked by?
_________.
A. It must be that B. It must have been
C. He must be D. This must have been
I can’t quite remember ______ you started doing the work.
A. that it is B. when it was that C. when was it that D. that was it when
I don’t know _________ makes her afraid of having her business discussed.
A. what it is about Mary that B. that is it about Mary that
C. what is it about Mary that D. that it is about Mary that
________ he made up his mind to take a trip to Europe?
A. When was it that B. That was it when
C. That it was when D. When it was that
In summer ________ hotter in Shanghai than in Beijing.
A. it is B. it were C. there is D. this is
_________ true that you met Premier Zhou once?
A. Were it B. Was it C. Is it D. Is there
_________ in the city that I saw your friend yesterday.
A. This is B. That is C. There is D. It is
参考答案 1-5 ADDCD 6-10 BBAAA 1 1-12 CD