Unit 5 Discover useful structures主语从句ppt课件-(2022新)人教版高中英语选择性必修第一册.pptx

1、新人教版选修一 Unit 5Discover Useful StructuresSubject 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Contents1234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. , 它是名词性从句的一种。2. 课文原句回顾。 1. However, concerned him most was

2、 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 6

3、0 percent of domestic rice.5. impresses people most about Yuan Longping is his ongoing ability to fulfil his dreams.whatthatHowwhetheritthatWhat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

4、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 hasnt been decided. Whoever breaks the law will be punished. Whatever I have is yours.3. 连接副词: when, wh

5、ere, how ,why. 在从句中作状语。 When we will leave hasnt been decided. How she keeps healthy is a secret. Why he cries is not clear. Where the meeting will be held is not known.主语从句学主语从句学法指导法指导依据依据“ “缺什么补什么缺什么补什么” ”原则确定正确的连词。原则确定正确的连词。所谓所谓“ “缺什么补什么缺什么补什么” ”是指是指从句从句与与连词连词之间的关系。之间的关系。如果句子中缺如果句子中缺主语主语，指，指人人用用w

6、ho，指，指物物用用what。如缺如缺宾语宾语，指，指人人用用whom，指，指物物用用what。如缺如缺时间状语时间状语用用when；地点状语地点状语用用where。 原因原因状语状语用用why；方式状语方式状语用用how。如缺如缺定语定语用用whose或或which。如如什么都不缺什么都不缺用用that，whether表表“ “是否是否” ”。主语从句注意事项Part 31. 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 know

7、n. 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 hell come here isnt clear. It isnt clear whether/if hell 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（ob

8、vious, 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)

9、+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）doIt is suggested/re

10、quested/ 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 kno

11、wn 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 hasnt 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

12、 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.WhatThatWhatThatwhat 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 41. Match the sentence parts. （P53）1. remains an unanswered question.2. is an important t

13、opic 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 i

14、s slower and healthierC. 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 thatDCAEB1. _ 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

15、 world is difficult to predict.5._ we will go camping tomorrow depends on the weather.6._ will take the place of our original headmaster hasnt 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

16、 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 committees policy can be put into practice.13. _ you need is a great teacher who lets you make mistakes.2. Fill the blan

17、ks with the right words.ThatWhetherWhatWhere/When/How/WhyWhowhetherwhatWhatWhatWhetherWhoWhyWhen/Where3. 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 stu

18、ck to his silly ideas.Why dinosaurs suddenly disappearedWhether you get on well with your classmateswhat made things worse was that it was getting darkIt is strange that1. 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 P129-1302. Finish the exercise P43-44Thanks