人教版（2019）选择性必修第二册Unit 1Science and Scientists Discover useful structures 表语从句 课件(共23张PPT)

(共23张PPT)
选择性必修二 Unit 1 Predicative Clause
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① 理解: 表语从句的结构及意义
② 掌握: 表语从句的连接词及使用规则
③ 运用: 表语从句,去表达自己的想法
Learning Aims
一定义：句子做表语, 被称为表语从句，跟在系动词的后面
One theory was that bad air caused the disease.
Another was that cholera was caused by an infection from germs in food or water.
It seemed that the woman liked the water from the pump so much that she had it delivered to her house every day.
The truth was that the water from the Broad Street pump had been infected by waste.
系动词有哪些？
二.引导词
类别 例词 说明
从属连词 that, whether 两者在从句中均不作成分，只起连接作用；that 无实义，whether表示“是否”
连接代词 who, what, which, whoever, whatever 等 在从句中作主语、宾语、表语、定语等成分。句子不完整
连接副词 when, where, how, why等 在从句中作时间、地点、方式、原因状语等成分。
其它连词 because, as if, as though That’s because...., It seems as if...
连接代词
who,what,which,whose,whom
whoever,whatever,whichever
主语
宾语
定语
连接代词在从句中______、 ______、______等成分，所跟句子不完整
连接副词
when,where,how,why
连接副词在从句中做状语。 所跟句子完整
判断是否是表语从句的关键
主要依据：跟在系动词后，且是一个句子，二者缺一不可
The problem is difficult.
The problem is that he can not speak English.
Sth
解题思路
先看句子是否完整
再分析“充当句子什么成分”，结合句意
句子完整 关系副词，从属连词，其它连词 when, where,why, how,that,whether, because, as if/though
句子不完整 关系代词 what, which, who, whose等
This is __________I want.
The problem was ______could do the work.
The village is _________ I used to spend my holiday.
That is ___________ we never thought of it.
The trouble is __________ we are short of funds.
My problem is __________ coat is suitable for me.
I ’d like to start my own business—that’s ________ I want to do if I had the money.
What I want to know is _______will support me.
what
where
who
because
that
which
what
who
Practice
9. There was an accident. That’s ______he was late for class.
10.What concerns me most is ______will be my teacher next term.
11.The trouble is _______I have lost his address.
12.The question is __________the film is worth seeing.
13.That’s ________I object to the plan
why
Practice
who
that
whether
why
when
where
why
how
what/whatever
which/whichever
who/whoever
whom,whose...
that,whether
as if/as though
because
Summary
Matters need attention：需要注意的事项
1. 表语从句的【特殊句式】
The reason why.... is that.... “...的原因是...”
The reason is that... “原因是...”
The reason ________ I like English is ________ it brings me happiness.
The reason is ________ English brings me joy.
2. This /That/ It is because.... “这/那是因为...”
This / That / It is why... “这/那就是...的原因。”
because引导表语从句，从句表原因。
why引导表语从句，从句表结果。
I like English. That is ________ it brings me joy.
English brings me joy. That is _______ I like it.
because
why
1.He is careless and irresponsible. That was _______ he was
fired.
2.He was fired. That was _________ he is careless and
irresponsible.
3. The reason _______ he was fired was ________ he was
careless and irresponsible.
why
because
why
that
即学即练
2. 表语从句的【常见句式】
It seems/ appears that +句子 “似乎...”
It turns out /proves that +句子 “结果、原来...”
The chances are that +句子 “可能....”
It seems that we are going to be late
It turns out/proves that she was a friend of my sister.
The chances are that he will recover from his injury in time for the next game.
3. 表语从句中的【虚拟语气】
主语是表示“建议”“命令”“要求”的名词，表语从句应使用虚拟语气，即：(should) +动词原形
建议: suggestion, advice,proposal,idea
命令: order, command,
要求: request,requirement
4. as if/as though引导表语从句的【两种语气】
1.若与事实相一致时，就用陈述语气；
2.若与客观事实不符，就用虚拟语气；
若跟现在事实不符：过去式（be动词用were）
若跟过去事实不符：had done
若跟将来事实不符：would/could+动词原形
My suggestion is that we __________ (go) to hospital at once.
When a pencil is partly in a glass of water, it looks as if it _______(be) broken.
My idea is that we ___________(get) more people to attend the conference.
The little girl talked as if she ___________(be) a grown-up.
She looks as if she _________(be) ten years younger.
should go
were
should get
had been
were
即学即练
5. whether用法。
注意
whether 表达“是否”， 句子主语通常是一些抽象名词，比如: question, problem, suggestion, idea, reason, point等
The point is whether we should lend him the money.
The problem is whether they support the plan.
when
where
why
how
what/whatever
which/whichever
who/whoever
whom,whose...
that,whether
as if/as though
because
Summary
A: Absolutely ! You may not believe it, but that was ___________ happened at the initial stage of our group's research on developing a vaccine for malaria.
B:Yes, it is. And it seemed____________all the theories were useful, but the fact was_________we couldn't persuade one another that one theory was better than another.
C:Exactly The problem was not about__________all our theories were equally good, but in deciding________theory to depend upon.
D:We realised that what we cared about was not____________aspect we needed to develop a theory in, but rather _____________we can reduce the cost of a vaccine without reducing its effect!
E: You're right. At last, we became focused on the key issue, which was _________we had to carry out the research in the first place.
what
as if
that
whether
whose
which
how
why
as if that what who when How why whose which whether