人教版（2019）选择性必修第一册Unit5 Working the Land Discove ruseful structures主语从句课件(24张ppt)

(共24张PPT)
新人教版选修一 Unit 5
Discover Useful Structures
Subject clauses
主语从句定义
主语从句连接词
主语从句注意事项
巩固练习
Contents
1
2
3
4
主语从句定义
Part 1
主语从句定义
1. 找出下列句子的主语。
1. Jim is good at playing the piano.
2. To see is to believe.
3. Smoking is bad for health.
4. What he has said is true.
在主从复合句中充当主语的从句就是主语从句, 它是名词性从句的一种。
2. 课文原句回顾。
1. However, 　　　　 concerned him most was 　　　　
farmers often had poor harvests and sometimes even had a
serious shortage of food to eat.
2. 　　　　 this could be done was a challenging question at the
time.
3. However, 　　　　 it was possible to develop a hybrid of self-
pollinating plants such as rice was a matter of great debate.
4. Today, 　　　　 is estimated 　　　　 about 60 percent of
domestic rice...
5. 　　　　 impresses people most about Yuan Longping is his
ongoing ability to fulfil his dreams.
what
that
How
whether
it
that
What
主语从句连接词
Part 2
主语的连接词
1. 从属连词: that, whether/if
That he will come is certain.
Whether he will come is uncertain.
that只起连接作用，本身无意义，不充当任何成分，但不能省略。whether/if意为是否，只起连接作用，不作成分。
2. 连接代词：what, who, whom, whose, which, whatever,
whoever, whichever等。它们在主语从句中既起连接作用
又在从句中充当主语、宾语、或表语。
Who will go makes no difference.
What we need is more time.
Which book I shall choose hasn't been decided.
Whoever breaks the law will be punished.
Whatever I have is yours.
3. 连接副词: when, where, how ,why. 在从句中作状语。
When we will leave hasn't been decided.
How she keeps healthy is a secret.
Why he cries is not clear.
Where the meeting will be held is not known.
主语从句学法指导
依据“缺什么补什么”原则确定正确的连词。
所谓“缺什么补什么”是指从句与连词之间的关系。
如果句子中缺主语，指人用who，指物用what。
如缺宾语，指人用whom，指物用what。
如缺时间状语用when；地点状语用where。
原因状语用why；方式状语用how。
如缺定语用whose或which。
如什么都不缺用that，whether表“是否”。
主语从句注意事项
Part 3
1. 主语从句一般放在句首, 但有时为了使句子结构平衡, 避免
“头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。
1. That the earth moves around the sun is well known.
It is well known that the earth moves around the sun.
2. That she has made such a mistake is a pity .
It is a pity that she has made such a mistake.
3. Whether he'll come here isn't clear.
It isn't clear whether/if he'll come here.
注意：主语从句位于句首时, 不能用if 引导, 主语从句后置时, 才可以用if引导。
It作形式主语的常见句型:
(1) It +be+形容词（obvious, true, surprising, wonderful, possible, likely, certain) +that 从句
(2) It + be +过去分词(said, reported, thought, expected, decided, announced,suggested等)+that从句
(3) It + be +名词词组(a pity, a shame, good news, an honor,no wonder等)+that从句
(4)It+动词/动词短语(seem, appear, happen, matter, turn out, occur to等)+that 从句
1. It is a fact that he cheated in the exam.
2. It seems that he is not himself today.
3. It is necessary that we (should) have breakfast.
4. It was suggested that we (should) put off the meeting.
◆It is necessary/important/essential/vital/crucial/strange/natural等+that（should）do
◆It is suggested/requested/ desired/ordered/demanded等+that从句 （should）do
翻译下列句子:
接虚拟语气的主语从句:
2. 主语从句语序
When will he come is not known.
When he will come is not known.
√
×
主语从句一律用陈述语序，即主语在前，谓语在后。例如：
Whether they would support us was a problem.
What she said is true.
Where she is from is unknown.
When they will start is not known yet.
3. 主语从句的主谓一致问题
1. That he will pass the exam is certain.
2. Which book I shall choose hasn't been decided.
3. How she keeps healthy is a secret.
4. When they will start and where they will go _____(be)still
unknown.
are
当单个主语从句充当句子主语时，谓语动词用单数；当两个或两个以上的主语从句充当主语时，谓语动词用复数。
4. what 与 that在引导主语从句时的区别
1. _______ you said yesterday is right.
2. _______ she is still alive is exciting.
3. _______ he lost the bike worried him a lot.
4. _______ he lost yesterday is his bike.
What
That
What
That
what 既引导从句，又在从句中充当主语、宾语或表语，而that 只引导从句，不在从句中充当成分。
巩固练习
Part 4
1. Match the sentence parts. （P53）
1. remains an unanswered question.
2. is an important topic for us to research.
3. is that these chemicals may even cause cancer.
4. these vegetables can even be planted without any soil through this new technology.
5. is the reason why some people prefer to live in the country rather than in the city.
A. What worries many people
B. That the lifestyle is slower and healthier
C. How we can find a suitable solution to produce sufficient food
D. When these wheat farmers will join this pilot experiment
E. It amazed all of us that
D
C
A
E
B
1. ________ he will succeed is certain.
2. ________ he will go there is still a mystery.
3. ________ he said is not true.
4.________ will happen to the world is difficult to predict.
5.___________ we will go camping tomorrow depends on the weather.
6._______ will take the place of our original headmaster hasn’t been decided yet.
7._______ he gave up the chance of studying abroad is unknown.
8.________ we will have the picnic next week is being discussed.
9. ____________________________ he hid the money is to be found out.
10. ________will be chosen our new monitor is still unknown.
11. It is by no means clear_____ the president can do to end the strike.
12. It remains to be seen __________ the newly formed committee's policy can be put into practice.
13. _______ you need is a great teacher who lets you make mistakes.
2. Fill the blanks with the right words.
That
Whether
What
Where/When/How/Why
Who
whether
what
What
What
Whether
Who
Why
When/Where
3. Complete the sentences.
1. _______________________________________________(为什么恐龙突然消失) still remains a mystery.
2. _____________________________________________________(你和同学相处是否融洽)will affect you mood.
3.The traveler lost his way in the woods, and (令事情更糟糕的是天快黑了)______________________________________________________________.
4. ________________________ (很奇怪)the man should have stuck to his silly ideas.
Why dinosaurs suddenly disappeared
Whether you get on well with your classmates
what made things worse was that it was getting dark
It is strange that
1. 你做的任何事都是正确的。
____________________________________________________
2. 手表属于谁是未知的。
____________________________________________________
3. 我们需要的是时间。
____________________________________________________
4. 大家相信善行会带给我们好运。
____________________________________________________
4. Translate the sentences.
Whatever you did was right.
Whom the watch belongs to is unknown.
What we need is time.
It is believed that good deeds will bring us fortune.
Homework：
1.Finish the exercise P129-130
2. Finish the exercise P43-44
Thanks