Unit 5 Working the Land Discover Useful Structures 美言佳句+主语从句（ppt课件）-2024新人教版（2019）《高中英语》选择性必修第一册.pptx

1、Unit Five美言佳句活动一：自主学习选择性必修一105页主语从句的相关知识1.在复合句中用作 _ 的从句，叫作主语从句。2.引导主语从句的词有连词 _、_(不能用_);连接代词 _、_、_等；连接副词_、_、_、_等。主语从句要用_语序。3.为了避免主语显得过长，尤其是陈述句作主语从句时，可以用 _作句子的形式主语，把主语从句移动到句子的末尾。4.当主语从句在句子中做主语时，谓语动词一般用_(单数/复数)谓语动词。主语thatwhetherifwhowhatwhichwherewhenhowwhy陈述句it单数1.However，what concerned him most was t

2、hat farmers often had poor harvests and sometimes even had a serious shortage of food to eat.2.How this could be done was a challenging question at the time.连接代词what 引导的主语从句连接副词how引导的主语从句活动二：判断画线部分是不是主语从句？3.Yuan was convinced that the answer could be found in the creation of hybrid rice.4.One charac

3、teristic of hybrids is that they usually attain a higher yield than conventional crops连词that引导的宾语从句。连词that引导的表语从句。5.However，whether it was possible to develop a hybrid of self-pollinating plants such as rice was a matter of great debate.6.The common assumption then was that it could not be done.连词wh

4、ether引导的主语从句。连词that引导的表语从句。7.Today，it is estimated that about 60 percent of domestic rice consumption in China is comprised of crops generated from Yuans hybrid strains.8.What impressed people most about Yuan Longping was his ongoing ability to fulfil his dreams 说明：为了避免主语太长，尤其是陈述句做主语从句或宾语从句时，可以用it 作

5、句子的形式主语或宾语，把主语从句或宾语从句移动到句子的末尾。连接代词what 引导的主语从句9.What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.连接that 引导的同位语从句10.Why different crops are grown is that they put important minerals back into the ground,making it ready for the next batch

6、 of crops.连接付词why 引导的主语从句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 cou

7、ntry rather than in the city.A.What worries many people B.That the lifestyle is slower and healthierC.How we can find a suitable solution to produce sufficient food while keeping the eveironment safeD.When these wheat farmers will join this pilot experimentE.It amazed all of us thatMatch the sentenc

8、e parts,and then translate the completed sentences into Chinese.DCAEB活动三Read the passage and underline all the subject clauses.Grandma has been complaining about the vegetables sold in the supermarket,which have been grown using chemical fertilisers.To her,that they look beautiful on the outside is

9、obvious.However,what she is unhappy about is the lower natritional value and reduced flavour.Now that both of my grandparents have retired fro their jobs in the city,how they are going to spend their retirement is an important decision for them.Whether they can live a healthy life is the first thing

10、 they are considering.So they have made up their minds to move to the countryside,where they can live a green life.活动四当堂演练1._ is still unknown whether she will win the prize.2.It is believed by some scientists _ the long-term use of chemical pesticides(杀虫剂)can sometimes harm both the land and people

11、s health.3._ some scientists have found is that their long-term use can sometimes harm both the land and peoples health.4.What concerned him most was _ farmers often had poor harvests and sometimes even had a serious shortage of food to eat.5._ the earth is round is a fact.6.Why she has not showed u

12、p yet _(remain)a puzzle.ItthatWhatthatThatremains名词性从句包括哪些从句1.主语从句:复合句中用作主语的从句叫主语从句。How this could be done was a challenging question at the time.(50页）2.宾语从句：复合句中用作宾语的从句叫主语从句。Yuan Longping realised that larger fields were not the solution.(50页）3.表语从句：复合句中用作表语的从句叫表语从句。However，what concerned him most

13、was that farmers often had poor harvests and sometimes even had a serious shortage of food to eat.4.同位语从句：复合句中用作同位语的从句叫同位语从句。What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.(选必一56页课本原句）从句引导词(连词；连接代词；连接副词)作用位置主语从句ThatThat;whether;whethe

14、r;who;whose;who;whose;whoever;what;which;whoever;what;which;when;where;how;whywhen;where;how;why主语在主句谓语动词或系动词be 之前宾语从句ThatThat;if if;whether;whether;who;whose;who;whose;what;which;what;which;when;where;how;whywhen;where;how;why宾语在主句谓语动词、介词、某些形容词之后表语从句ThatThat;whether;as ifas if;who;what;who;what;which;which;when;where;how;why表语在系动词be之后同位语从句ThatThat;同位语在某些名词(fact;news等)之后if 是否，仅仅引导宾语从句。课堂小结