人教版（2019） 选择性必修 第二册Unit 1 Science and Scientists 表语从句课件 (20张ppt)

(共20张PPT)
Unit 1 Science and scientists 表语从句
Iearning objects
By the end of this period, you will be able to…
To learn the structure of predicative clause.
To know how to judge the predicative clause.
To master the conjunctions of predicative clause.
表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当。
What is the predicative？
Lead-in
表语从句的定义
The question is who will do it.
The question is difficult.
（ 表 ）
表语从句
（ 表 ）
在复合句中做表语的从句，叫做表语从句。它位于主句的系动词之后，对主语进行解释说明，使主语的内容具体化。
2. 表语从句的构成
主语 + 系动词 + 引导词 + 简单句
This is why he did it.
What I want to say is that I am tired.
表语从句
可以接表语从句的系动词有：
1. 状态系动词：be
2. 感官系动词：feel , seem , look, appear ,sound, taste , smell
3. 持续系动词：stand , lie , remain ,keep, stay
4. 变化系动词：become ,get , grow , turn , go , come, run, fall
5. 终止系动词：prove, turn out
是
......起来
保持
变得
证明是......
结果是......
她似乎是为了变得好看才保持身材的。
3. 引导词
从属连词：that / whether /as if /as though (if不引导表语从句)
连接代词：who / whom / whose / which/ what
连接副词：when / where / why / how
Predicative Clauses
( 表语从句)
在复合句中作表语的从句叫做表语从句。位于主句的系动词之后，对主语进行解释、说明，使主语的内容具体化。表语从句也必须用陈述语序。
“主语+系动词+表语从句(引导词+其他)”
Structure:
基本用法
1. The most important thing is that we finish the final task.
2. The question is whether we can finish it in such
a short time.
3. The reason why he was late is that he got up late.
(1)从属连词: that& whether
用法归纳：
a. that引导表语从句时，只起______作用，作/不作句子 成分，有/没有意义，不能省略。
b. whether引导表语从句时，只起______作用，作/不作句子成分，通常翻译为“______”。注意，引导表语从句时通常不用if。
连接
√
√
连接
√
是否
c. 注意下面这个结构：The reason why ... is / was that ...
引导词的用法
1. She is not she was.
2. Exercise is keeps us healthy.
3. The winner will be solves that problem.
(2) 连接代词: who, whom, whose, which, what, whatever, whoever, whichever, ...
用法归纳：
连接代词引导表语从句时，既起______作用，又作句子成分(通常作__________________)等。
连接
主语，宾语，表语
who
what
whoever
(3) 连接副词：when, where, why, how, whenever, wherever, ...
1. The house is Lu Xun once lived.
2. Tomorrow is it would be the most convenient.
4. That’s you should push yourself.
5. The best time to start is whenever you are ready.
3. The question is how much effort you can make.
用法归纳：
连接副词引导表语从句时，既起______作用，又作句子成分（通常作______）。
连接
状语
where
when
why
1. He looked as if he was going to cry.
2. That’s because we were in need of money at that time.
(4) 其他词：because, as if, as though, ...
1. 如果引出表语从句的名词是一些表示 “建议”或者是“命令”之类的词如advice, suggestion, proposal, order, plan, idea等, 那么从句中的动词通常用(should)+动词原形。
My suggestion is that we all ___________ (take) an active part in the coming sports meet.
2. His proposal was that the work _________________ (finish) in five hours.
(should) be finished
(should) take
Attention
2.That’s/It’s/This’s because…
That’s/It’s/This’s why…
The reason why…is that…
He was sent to the hospital. That’s he was ill.
2. He was ill. That’s he was sent to the hospital.
3. The reason he was sent to the hospital is
he was ill.
why
because
why
that
1. The fact is ______ different people have different opinions towards cloning.
2. What Alex really doubts is _________ his mother will recover from the disease soon.
3. The question is ______ we can do to solve the problem in such a short time.
4. The reason why he was late was ______ he failed to catch the first bus.
that
whether
what
that
选择正确的引导词填空。
Practice
5. I want to be a teacher. That's ______ I want to be.
6. I had neither a raincoat nor an umbrella. That's _____ I got wet all through.
7. The question is _____ we can turn to for help if necessary.
8. The most exciting moment was _______ I was awarded the first prize.
what
why
who
when
A. Absolutely. You may not believe it, but that was what happened at the initial
stage of our group's research on developing a vaccine for malaria.
B. Yes, it is. And it seemed as if all the theories were useful, but the fact was that
we couldn't persuade one another that one theory was better than another.
C. Exactly. The problem was not about whether all our theories were equally good,
but in deciding which/what/whose theory to depend upon.
D. We realised that what we cared about was not which aspect we needed to
develop a theory in, but rather how 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 why we
had to carry out the research in the first place.
Maria: This mix of theory and data is one of the key
characteristics of what we call science.
David: _____________________________________________
Maria: With your theoretical framework
David: _____________________________________________
Maria: Deciding on a theory is definitely of critical importance.
David: _____________________________________________
Maria: This was when you should have calmed down and got
down to doing some solid work.
David: ______________________________________________
Maria: So what happened in the end
David: ______________________________________________
A
B
D
C
E
Summary：
1. 表语从句的结构:
主语 + 系动词 + 引导词 + 简单句
2. 引导词:
｛
连词：that,whether,as,as if/though,because
连接代词：who,what,which,whom,whose...+ever
连接副词：when,where,how,why,...+ever
3. 注意点:
3）if 不引导表语从句。
4）表语从句的虚拟语气。
1）语序:连主谓。
2）that引导表语从句时不能省略。
表语从句
Thank you