重庆大学版高中英语必修必修 3 Unit 6 Perseverance语法it的用法课件（共54张）

课件54张PPT。 the use of itWhat’s the dog doing?It’s surfing the internet. 基本用法Where is my book?It ’s in the box. 基本用法I’m sorry to make you sad?It doesn’t matter 基本用法 基本用法What’s the baby doing?It ‘s swimmingIt 用作人称代词，
代替前文提到过的
事物和事情
也可指性别不详的幼儿
What’s this/that?It ’s a dinosaur 基本用法It 用作指示代词，
相当于 this 或that
It’s 10:08It’s 30 cm It is 2 kilosIt’s a large sum of money30cmIt is… .What’s the
weather like?It 用作非人称代词，
指时间,
距离，
度量，
天气
…
it表示时间常用于句型：
1、It is/has been＋一段时间＋since 从句。意为“自……以来已有多长时间了”或“自不……以来已有多长时间了”。例如： 1）It is/has been many years since I was last in London 自从我上次到伦敦，已经有许多年了。
2）It’s a long time since we met last. 自从我们上次见面以来已经有很长一段时间了。
2、It is/ was/ will be + 一段时间 + before 从句。表示“在（做某事）前过了多长时间”，或“过了多长时间才……”。如：
But it ________more than 100 years before the country begins once again to look as it did before.
但是在100年之后，这个国家才能恢复到以前的样子。will beThe boy became fatter and fatter each
day and ＿＿＿made his parents sad.?
　　A.which ? B.what?
C.he ? D.it?
2. Someone is ringing the doorbell.
Go and see ＿＿＿＿＿＿.
　　A.who is he? B.who he is?
C.who is it? D.who it is? exercisesit 指人主要用于确定
未知的或身份不明的人 It指代前面整个句子 it 代词
（基本
用法）人称代词指示代词非人称代词
summary it作形式主语当不定式、动名词以及从句作主语时，为避免“头重脚轻”， 常用it 作形式主语，而将真正主语后置形式主语学习英语非常有趣。 it is very interesting to study English.
…
possible
It is/was +adj. necessary +
important
…
…
one’s duty
It +is /was + n. one’s hope +
an honour
… …
said
It is / was + p.p. known
believed
… clause
( for sb. ) to do sth.
+ that-clause
( for/of sb. ) to do sth
clauseIt +be+ …no good/no use… + doingIt seems/happened/matters/…+从句

1.吸烟危害健康，这是事实。

2.碰巧我们在同一间大学 。
3.据说日本发生了地震。
4.劝他戒烟实在浪费时间。


It is a fact that smoking does harm to
health.
It happens that we are in the same college.

__________ there is an earthquake in Japan.

It is a waste of time _______ (try)to persuade him to give up smoking.
tryingIt is said thatIt is/was +adj.+ (for/of sb.) +to do sth.It is impolite _____him to laugh at other
students .
It is important__ her to come to the party.
通常为描述事件的形容词：easy，difficult，
hard，necessary， possible， right，
wrong，important， legal，illegal，
clear，obvious， useful， …
通常为描述人的形容词nice, kind,
stupid, clever,foolish, polite,
impolite, silly, selfishof for对比动名词(It +be+ n./ adj.+ doing)用no good, no use, (great) fun, a waste
of time/money, 等名词作表语； 为他工作很有意思。
覆水难收
It is fun ________for him.it is no use ______for the spilt milk
cryingworkingIt is said that… 据说……

It is reported that…
It is supposed that…
It is hoped that…
It is well known that…
据报导……据推测……希望……众所周知……普遍认为……有人建议……It is said (reported....) that ...It is suggested that…It is generally considered that…该句型中的it 仍是形式主语，真正主语是
that引导的主语从句。
特别提醒It’s necessary/strange/natural/important
/essential/vital/advisable… + Clause
从句中的动词要用虚拟, 即(should)+动词原形2.It is/was suggested /ordered /
demanded / proposed / etc. 3.It is (high) time that clause从句谓语动词要用过去式或用should+动词
原形，但should不可省略。
4. It is/was the first ( second ... ) time that ... 从句谓语动词要用 have/had +done1.有必要立即派他去北京。
It is necessary that___________________
right away.
2.有人建议，英语晚会周六举行。
It is suggested that the English evening
_____________________.
3.该是我们吃午饭的时候了。
It is high time that__________________
_____________________.
4.It was the fifth time (that) I _______
(pay）a friendly visit to Africa .

he be sent to Beijing
be held on Saturdaywe had lunch/we should have lunch had paid误用形式主语的几种情况

A:在该用it作形式主语的地方而误用其他词
Is ____ necessary to tell his father everything?
A. it B. that C. what D.he
B:在不该用it作形式主语的地方而误用形式主语
1.____must be something wrong with the machine.
A. There B. It C. He D. That
2.____is no need to send for the doctor
3.____is no doubt that he is qualified for the job
4.____is known to us that the earth runs around the earth .
5.____is known to us, the earth runs around the earth .
6._____ is known to us is that the earth runs around the earth
A. It B. which C. As D. What
AAA AIt As What
that,isis it作形式宾语当复合宾语的宾语是不定式，动名词
或从句时，如果其后有宾语补足语，
则需用it作形式宾语，将真正宾语后置形式宾语觉得学英语很难I find it difficult to learn English.
主语＋谓语＋ it +adj./n. +
形式宾语to do
doing
从句常见的动词包括：think/believe/suppose
find/consider/feel/make…
Sentence patterns1.我们的老师认为学习而不实践是没有好处的
Our teacher thinks____ no good ________
without practice.
Our teacher thinks it is no good learning
without practice.
2.我发现她很容易相处。
I find it easy to get on with her. I find it is easy to get on with her.
形式宾语
对比 itlearning
I like ___ in the autumn when the weather is clear and bright.(04全国)
A. this B. that C. it D. one感情类动词(如like, love, enjoy, dislike, hate, appreciate等) 后接从句,必须先由it担任形式宾语,再接从句.I like (enjoy, hate…) it when/if…Sentence patterns:CShe won’t like it if you arrive late.
He hates it when people use his bike.
enjoy, like, dislike, love, hate, prefer,
appreciate等动词后接 if 从句或 when 从句，
通常应先在动词后接 it 作形式宾语。
She won’t like it if you arrive late.
她不喜欢你迟到。
He hates it when people use his bike.
他讨厌别人用他的自行车。
I hate it if you say such things in public.
我讨厌你在大庭广众之下说那样的事。
I’d prefer it if I didn’t have to do so much work.
要是我不必做那么多工作，那就太好了。
I would appreciate it very much if you
would help me with it. 如果你能帮助我做这事，
我会十分感激。
强调句型要强调句子的某一部分, 通常是主语、状语、
宾语, 可以把it当作先行词。
这种句子的结构是
“It is/was+被强调部分+that/who+
句子的其他部分”。
在此结构中 be助动词必须是单数，
因为主语是It；连接词必须是that 指人
也可是who宾语用whom.
强调句型 I met an old friend in the cinema last week. It was __ who/that met an old friend in the cinema last week. It was __________ who/that I met in the cinema last week. It was _________ that I met an old friend in the cinema. ?强调主语：?强调宾语：?强调时间状语： 句型转换__?强调地点状语：It was __________ that I
met an old friend last week. ___________________________Ian old friendin the cinemalast week那能不能强调谓语动词met呢？I did meet an old friend in the cinema
last week 强调句型的判断
1) It was the street ____ I met an old friend of mine yesterday.
that B. where C. which D. what
2) It was in the street ____ I met an old friend of mine yesterday.
3)It was 6:00 _____ we had our supper yesterday evening.
4)It was at 6:00 _______we had our supper
yesterday evening.
B A thatwhen将“It is/was …that/who…”结构去掉，
剩下的部分能构成一个完整的句子便是强调句。
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

In which play is ___ your brother appears?
A. that where B. this when C. it that D. it where

It was in the lab ___ was taken charge of by Professor Zhang ___ they did the experiment.
A. where; that B. which ; where
C. that ; where D. which; that被强调的部分是not until引导的时间 状语?强调句型
用于疑问句,
? 疑问词+ is it that…?It is …that…Is it …that…?强调句型和各种从句高考热点?
强调句型1.It wasn’t until nearly a month later ____I received the manager’s reply. (2005全国卷I)
A.since B.when C.as D.that
2.Was it because it snowed last night ___ he didn‘t come ??
A. why B. that C. when D. which?
_____________you met the Englishman?　A. Where it was that　　 B. Who it was that　C. Where was it that　　 D. Where was that
4. It is in Beihai Park ___ they made a date for the first time ___ the old couple told us their love story.
A. where; that B. that; that
C. where; when D. that; when it 代词
（基本
用法）人称代词指示代词非人称代词
引导词
强调句:It is/was+强调部分+that
+剩下部分it 用作形式主语
it 用作形式宾语 summaryExercise Bar Ⅰ. it / that /there / what
1. It is believed ______ if a book is
interesting, ____ will surely interest
the reader.
2. ______ is no need to take a bus there
because ___is only ten minutes’ walk.
3. _____ was said makes me upset.
4. He works day and night so ___ is no
wonder _____ his health is poor.
thatitThereitWhatitthatⅡ. 单项选择
1. He didn’t make ____ clear when and where the meeting would be held. (天津2007)
this B. that C. it D. these
2. _____ is our belief that improvements in health care will lead to a stronger, more prosperous economy. (浙江2006)
A. As B. That C. This D. It高考实例
4. I’d appreciate ______ if you would like to teach me how to use the computer. (山东2006)
A. that B. it C. this D. you高考实例3. It’s the third time ＿＿＿＿＿ arrived late
this month
A. that you? B. when you
C. that you’ve ?D. when you’ve? 5. It was ______ he came back from
Africa that year______ he met the girl he
would like to marry.(江西2009)
A when; then B not; until
C not until; that D olny, when
6.It was along the Missippi River ______
Mark Twain spent much of hid childhood
(天津2008)
A how B which C that D where高考实例Ⅲ .单句改错
下面的句子选自高考试题的改错部分，用你的火眼金睛把错误找出来吧！
1. You won’t find difficult to get to the city center. (2004全国卷IV)
2. I know there is not easy to be a teacher. (湖北2004)
3. This is not surprising that the Silver Ghost was regarded as “the best car in the world”.
4. Being Sunday ,the library doesn’t open find后加itthere → itThis → ItBeing Sunday→ It being SundayHomework1. Finish exercise 2 on page 21: Rewrite the sentences.
2. Revise and master the use of it.
3. Preview the Reading: HIV/AIDS: Are you at risk?I didn’t realize she was a famous film star until she took off her dark glasses.Not until she took off her dark glasses did
I realize she was a famous film star.
It was not until she took off her dark
glasses that I realized she was a
famous film star.
It is not until + 被强调部分 + that ...
直到雨停了我才回家。
I didn't go home until rain stopped.
Not until the rain stopped did I go home.
It was not until the rain stopped that
I went home
It is/was +n.+ to do sth.
他会不会来, 还是个问题。
熬夜太晚不是一个好习惯.
It is still a question whether he
will come .

___is not to too late.
Ita good habitstay up a pity ，a shame ,a fact ,a wonder ,
a good thing,a question…It happens (seems， appears) that... 该句型中it是形式主语，that 引导的是主语
从句，主句中的happen ， seem等词
是不及物动词。 碰巧我们在同一间大学
看来要下雨了。
It happens that we are in the same college.
It seems that it is going to rain.
1.—Why don’t we take a little break ?
—Didn’t we just have _________ ?
2. I can't find my hat. I think I must buy ___ .
3. The hat you bought is bigger than ___ I
bought.
4. I can't find my hat. I don' t know where I
put __.
比较辩异 one，that 和it one表示泛指，that和it 表示特指。that与
所指名词为同类，但不是同一个，而it 与
所指名词为同一个。oneonethatthe oneitThank you