高中英语语法 主语从句（24张PPT）.ppt

1、Noun clauses as the subjectpreparation What part does the underlined part serve as in each sentence?A tree has fallen across the road.You are a student.To find your way can be a problem.Smoking is bad for you.What she said is not yet known.That we shall be late is certain.It is certain that we shall

2、 be late.主语名词充当主语人称代词充当主语不定式充当主语动名词充当主语句子充当主语句子充当主语it充当形式主语Lets see which group can find the sentences like the following examples in Reading on Page25-26 more quickly.Attention please:1.Four or six people in a group.2.Try to find as many sentences like the following examples as possible!3.If your g

3、roup finish the task,please put up your hand and one member should tell us all the sentences your group have found.Group competitionExamples:(sentences served as subject)What she said is not yet known.That we shall be late is certain.It is certain that we shall be late.1.What it was to become was un

4、certain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.地球会变成什么样子，直到45亿至38亿年前这个云团变成固体的球状物，才确定下来。2.The earth became so violent that it was not clear whether the shape would last or not.地球变得激烈动荡，不知道这个固体形状 是否会继续存在下去。3.What is even more important is that as the earth

5、 cooled down,water began to appear on its surface.更重要的是，随着地球的冷却，地球的表面就开始出现了水。4.It was not immediately obvious that water was to be fundamental to the development of life.水对于生命的发展会起关键作用，这一点在当时并不明显。Read&translate所有划线的句子都充当_.那么什么是主语从句呢？主语主语从句(Subject Clause)如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。That he finish

6、ed writing the composition in such a short time surprised us all.What we need are good doctors.Whom we must study for is a question of great importance.What is subject clause?主语从句三要素he became a great scientist is known to us all.Is what you told me really true?谓语动词用单数从句用陈述语序不能省略关联词Notice:What we nee

7、d most are books.How_has not been found.Student A:where was Thomas Edison born?Students B:I dont know.I cant find the answer in the passage.Where he was born _is still unknown.Student A:who will win the English speech contest?Students B:I dont know.It is hard to say.Who will win the match _will be w

8、elcome.Student A:Tom,tomorrow is your birthday.Who do you invite?Students B:I will welcome everyone who comes to my party.Whoever comes 在主语从句中,谓语一般用单数。无论他说什么都不重要。Whatever he says is of no importance.无论谁说这话都不对。Whoever says that is wrong但谓语动词用单数还是复数,不可一概而论,而要视句子的意义而定。What I need is money.What I need a

9、re books.what 与that 在引导主语从句时的区别what 引导主语从句时在句时在从句中充当句子成分,如主语、宾语、表语,而that 则不然。1)What you said yesterday is right.2)That she is still alive is a consolation.为了防止句子头重脚轻，通常把形式主语it 放在主语位置，真正主语后置。1.It is certain that he will win the match.That he will win the match is certain.2.It is true that he has made

10、 a very important discovery in chemistry.That he has made a very important discovery in chemistry is true.3.It is very likely that they will hold a meeting.That they will hold a meeting is very likely.1.以that 引出的主语从句,常以形式主语it引导,结构为:It is+形容词/名词/某些动词ed+that 从句。(1)It is+形容词/名词+that 从句，如：It is a pity/s

11、hame that 遗憾的是 It is possible that 很可能 It is unlike that 不可能 (2)It+不及物动词+that 从句，如：It seems/appears that.似乎 It happened that 碰巧(3)It +be+过去分词+that 从句It is said that 据说 It is known to all that 众所周知It is reported that 据报道It is believed that 人们相信(3)It is suggested that 有人建议(4)It must be pointed out tha

12、t 必须指出Try your luck!Choose the pictures and finish the exercise with your group!Finish ex.2 in Discovering useful structures.Group workDiscovering useful structures1.His discovery has not yet been proved.What _.2.Do the other astronomers accept his ideas?It remains a question.Whether _.3.The first a

13、ppearance of life on earth is still a mystery to scientists.How _.has not yet been proved is his discoveryother astronomers accepts his ideas remains a questionlife first appeared on earth is still a mystery to scientistsEx.24.Why is the earth becoming warmer?It is an important topic for research.Wh

14、y _.5.Stephen Hawking at 65 experienced zero gravity during a flight.It amazed everybody.It amazed everybody _.6.Pluto is no longer considered a planet in our solar system.What a surprise!It is a surprise _.that Stephen Hawking at 65 experienced zero gravity during a flight.that Pluto is no longer considered a planet in our solar system the earth is becoming warmer is an important topic for research