人教版（2019）选择性必修第二册 Unit 1 Science and scientists Discover Useful Structures 课件（23张ppt）

(共23张PPT)
Discovering useful structures
表语从句
Predicative Clause
Step 1 学习目标：1’
1. 了解表语从句的定义，关系词的使用规则及注意点。
2. 能够正确理解并运用表语从句。
Step 2 问题导学:8’
Answer the following questions：
1)表语从句的引导词有哪些？
2)表语从句的语法规则有哪些？
表语从句的定义
Step 3 点拨精讲:25’
表语从句的定义
The definition of predicative clause
The question is who will do it.
The question is difficult.
在复合句充当表语的从句叫表语从句
表语从句的判断
The judgment of the predicative clause
What I want to say is that I am tired.
She doesn’t know whether she likes him or not.
He was sent to the hospital. That is because he was ill.
It sounds as if somebody was knocking at the door.
The reason why he was late was that he missed the train this morning.
表语从句的判断
The judgment of the predicative clause
系动词后的成分为表语。系动词后的从句为表语从句。
系动词主要是be动词（am, is, are, was, were)，意为“是”。
其它系动词：
1)持续系动词（表示主语持续或保持一种状态）：
keep, remain, stay, stand
2) “像”系动词（表示看起来像）：seem, appear, look
3)感官系动词：look, feel, smell, sound, taste
4)变化系动词（主语变成什么样）：become, grow, turn, fall, get, go
5)终止系动词（主语已终止动作）：prove, turn out
表语从句的引导词
引导词
Conjunction words
引导词 用法
从属连词 无成分，无意义
无成分，意为“是否”
连接代词 在从句中充当主语，宾语，表语，定语
连接副词 在从句中充当状语
其它连接词 因为，好像，似乎
that
whether
what,which,who,whom,
whose, …+ever,
how, when, where, why,
because, as if , as though
即学即练
learning and practice
This is __________I want.
My English is limited. This is _______I hate reading English books.
The village is _________ I used to spend my holiday.
The reason why I love him is ___________ I really like the way he behaves.
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
why
that
that
which
what
who
表语从句的语法规则
表语从句的语法规则
The grammar rulers of the predicative clause
The question is how can I make you understand the knowledge.
The question is how I can make you understand the knowledge.
Rule 1 : 表语从句和宾语从句、主语从句一样，要用陈述语序：主语+谓语。
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 2 : 表语从句的引导词没有if !!!
The question is if it is worthwhile to do it.
The question is whether it is worthwhile to do it.
只用whether ,不用if的情况
Whether to do
Whether……or not
介词后的宾语从句
从句：句首的主语从句，表语从句，同位语从句
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 3 : 表语从句的虚拟语气
My proposal is that we (should) start early tomorrow.
I propose that we (should) start early tomorrow.
It is proposed that we (should) start early tomorrow.
在表示“建议，劝说，命令”的名词 advice, suggestion, request, proposal 等后面的表语从句中，谓语动词用“should + 动词原形”，should可省略。
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 3 : as if/as though 引导的表语从句常跟在look, seem, sound, feel等后面。
语气： 若表示真实情况：用陈述语气
若表示非真实情况：用虚拟语气
Dark clouds are gathering. It looks as if it’s going to rain.
It seemed as if the night would never end.
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 3 : as if/as though 引导的表语从句的虚拟语气：
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
The little boy talks as if he knew everything in the world.
He felt as if he had met this young lady before somewhere.
即学即练
learning and practice
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 proposal 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
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 4 : because引导表语从句通常只用于“This/That/It is because…”结构中。
I do so many things for you. It is because I love you.
I am late this morning. That is because I left my bag on the subway.
Your speech is excellent. This is because you prepared it a lot.
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 5 :当从句描述原因时：
主语为reason 时，引导词用that
The reason why....is that.....
It, This, That 开头做主语，引导词用because
She was late this morning. That was because she missed the early bus.
The reason why he was late was that he missed the early bus.
表语从句的语法规则
The grammar rulers of the predicative clause
Rule 6 :引导词that, because, why的区别：
描述原因用that或because.
描述结果用why
The reason was that you don’t trust her.
He was sent to the hospital. That’s because he was ill.
He was ill. That’s why he was sent to the hospital.
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
Step 4 课堂小结1'
1.表语从句的概念
2.表语从句的连接词
3.表语从句的用法
一.单句语法填空
1.The fact is ______ I was in the scene when the theft happened.
2. She has remained ________ I stood yesterday for an hour.
3.The place is no longer ________it used to be.
4.(2020辽宁丹东期末) That sound is _______ local residents remember when they think of old Beijing.
5.(2019四川达州二诊) Our world has seen an increasing number of students pressuring their parents into buying luxuries (奢侈品) just to look good before their peers. Problem is _______ is to blame, parents, students or other members of society.
that
Step 5 当堂检测10'
where
what
what
who
三.句型运用
我最担心的是我能否在英语考试中取得好成绩。众所周知，学好英语是很重要的。那是因为它是一种国际语言。在我看来，学习的成功主要取决于一个人是否有决心。能不能学好还有待去证明。我现在要做的是采取措施学好英语。
What worries me most is whether I can achieve a good mark in English. It is known to all that it is important to learn English well. It is because it is an international language./The reason is that it is an international language. In my opinion, success in study depends mainly on whether one can have great determination. It remains to be seen whether I can learn it well. What I should do now is to take measures to master English.
二.单句翻译
1. 我的建议是我们明天一早就出发。
My suggestion is that we should start early tomorrow.
2. 我突然想起，今天是她的生日。
It suddenly occurs to me/strikes me that today is her birthday.
3. 众所周知，台湾是中国的一部分。
It is well known that Taiwan is a part of China.
4.足球比赛是否举行将视天气而定。
Whether the football game will be held depends on the weather.