人教版（2019）选择性必修第二册 Unit1 Science and Scientists单元语法详解课件(共15张PPT)

(共15张PPT)
Unit 1 Science and scientists
单元语法详解
人教版新教材选择性必修二
本单元重要语法
→表语从句
◆原句再现
a. One theory was that bad air caused the disease. (教材 P2)
b. Another was that cholera was caused by an infection from
germs in food or water. (教材 P2)
c. It seemed that the woman liked the water from the pump
so much that she had it delivered to her house every day. (教
材 P2)
d. The truth was that the water from the Broad Street pump
had been infected by waste. (教材 P3)
e. And it seemed that all the theories were useful, but the
fact was that we couldn’t persuade one another… (教材P5)
◆ 表语从句的概念
●表语从句在复合句中作主句的表语。表语从句和主语指同一内容，是对主语进行的解释和说明，使主语的内容具体化，请观察下面的句子
The truth is that he is the thief
事实上他就是小偷
(这里，表语从句是对主句主语 truth的说明表语放在系动词 is之后 ,从属连词 that引导表语从句)
◆ 表语从句的表现形式
●由连词 whether 和 that引导表语从句，常用句型:
The reason is that….原因是……
The problem is whether….问题是是否….
The trouble is that…..麻烦在于…. 请观察以下句子
a. The problem is whether we should ask them for help.
问题是我们是否请他们帮忙
b. The trouble is that he has never done the work before.
麻烦在于他以前从未做过这个工作
c. The reason is that he has often lied.
原因是他经常说谎
d. Their wonder is whether he will attend the meeting.
※ 悄悄告诉你：that 虽然在其引导的表语从句中无实际意义，也不充当句子成分，但一般不可省略；whether 意思是 “是否”，在句中不充当句子成分，不可省略; if 也有
“是否” 之意，但不能引导表语从句
● 由连接代词 who, what, which引导的表语从句，请观察以下句子
a. She is not what she used to be.
她不再是过去的那个她了
b. What I mean is which song you like best.
我的意思是你最喜欢哪首歌
c. The question is who will be sent to look after the old man.
问题是派谁去照顾这个老人
d. This is what the boss said at the meeting.
这就是老板在会上说的话
e. The problem is which books are worth reading for us all.
问题是，对于我们所有人来说，那些书值得读
●由连接副词(where, when, how, why)引导表语从句请观察以下句子
a. That is where Chairman Mao used to live.
那就是毛主席曾经住过的地方
b. The problem is when they will arrive at the airport.
问题是他们什么时候到达机场
c. That's why he didn't pass the exam.
那就是他考试不及格的原因
d. She works too hard. That is why she is exhausted.
她工作太辛苦了，这是她筋疲力尽的原因
e. This is how they solve the problem.
这就是他们如何解决这个问题的
a. It looks as if it were going to rain.
天看上去好像要下雨
b. It looks as though he is willing to go there.
看起来他好像愿意去那里
c. That's because two thirds of the earth's surface is made up of vast oceans.
那是因为地球表面的三分之二是由广阔的海洋组成的
d. The reason why she was late for work is because she was trapped in traffic jam.
她上班迟到的原因是遇上了交通阻塞
● 由as if 或 as though, because 引导表语从句，请观察以下句子
◆ 动词跟表语从句的用法
It appears that... 似乎....
It seems that…. 好像......
It turns/turned out that... 结果….; 证明是….
It happens that...恰好….
请观察以下句子
a. It appears that he will win the prize.
看起来他会得奖
b. It seems that he is lying.
看样子他好像是在撒谎
c. It turned out that two travelers had been killed.
后来证实有两位旅客丧生
● be, seem, look, appear, turn/turn out, happen, remain 等系动词后均可跟表语从句, 常见以下类似结构
d. It happened that the famous actor was her brother.
那个有名的演员恰好是她的哥哥
e. The fact remains that we are behind the other classes.
事实是我们落后于其他班级
f. It seems that these children are reading.
孩子们似乎在读书
g. It appears that all the soldiers have come here.
好像所有的士兵都到了
◆考点训练
1. The question is ________ we will have our sports meet next week.
A. that B. if C. when D. whether
2．The reason why he failed is ________he was too careless.
A. because B. that C. for D. because of
3. Go and get your coat. It’s ________you left it
A. where B. there C. there where D. where there
4．The problem is _________to take the place of Ted
A. who can we get B. what we can get
C. who we can get D. that we can get
5. What I want to know is ______ he likes the gift given by us.
A. that B. if C. whether D.不填
6. The reason is ________ I missed the bus.
A. that B. when C. why D. what
D
B
A
C
C
A
7. That is ______ we were late last time.
A. that B. when C. why D. what
8. She looked _________ she were ten years younger.
A. that B. like C. as D. as though
9. --I fell sick! --I think it is _______ you are doing too much.
A. why B. when C. what D. because
10. The reason why he hasn’t come is ___________.
A. because his mother is ill B. because of his mother’s being ill
C. that his mother is ill D. for his mother is ill
11. --He was born here. -- That is _______ he likes the place so much.
A. that B. what C. why D. how
12.That is ________ Lu Xun once lived.
A. what B. where C. that D. why
C
D
D
C
C
B
13．_______ your father wants to know is ________ getting on with your studies.
A. What; how are you B. That；how you are
C. How；that you are D. What；how you are
14. The trouble is ________ we are short of tools.
A. what B. that C. how D. why that
15. America was __________was first called “India” by Columbus.
A. what B. where C. the place D. there where
16. China is becoming stronger and stronger. It is no longer _______ .
A. what it used to be B. what it was used to being
C. what it used to being D. what it was used to be
17. ________ he really means is ________ he disagrees with us.
A. What … that B. That … what
C. What … what D. That … what
D
B
A
A
C
18. The energy is ________ makes the cells able to do their work.
A. that B. which C. what D. such
19 .I had neither a raincoat nor an umbrella ______ I got wet through.
A. It’s the reason B. That’s why C. There’s why D. It’s how
20. See the flags on top of the building That was ________ we did this morning.
A. when B. which C. where D. what
21. -- Are you still thinking about yesterday’s game --Oh, that’s _________.
A. what makes me feel excited B. whatever I feel excited about
C. how I feel about it D. when I feel excited
22. What surprised me was not what he said but ______ he said it.
A. the way B. in the way that C. in the way D. the way which
C
B
D
A
A
That’s all!
Thank you!