seaGrammar主语从句

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1、名词性从句在一个句子中充当主语的时名词性从句在一个句子中充当主语的时候，我们称之为主语从句。候，我们称之为主语从句。That food companies(should)often use red,green,orange and yellow is not surprising.1.主语从句可以由主语从句可以由 that引导。引导词引导。引导词 that在主语从在主语从句中不作任何成分句中不作任何成分,也没有中文意义。当主语从也没有中文意义。当主语从句位于句首时句位于句首时,that不能省略。不能省略。That we need more practice is quite clear.Tha

2、t they come to our rescue deeply touched our hearts.That her hair was turning grey worried her a bit.2.如果主语很长如果主语很长,常用以常用以“it”作形式主语的作形式主语的结构。结构。It is a fact that English has been acceptedas an international language.英语已成为一种国际性的语言是不争的事实。英语已成为一种国际性的语言是不争的事实。=That English has been accepted as an intern

3、ational language is a fact.常见的常见的it作形式主语的结构作形式主语的结构:1)It+be+adj.+that 从句从句2)It+be+said/believed/known+that从从句句3)It+seems/happens/appears+that 从从句句4)It+be+a pity/fact+that从句从句It is important that we should learn a foreign language.It is still unknown which team will win the match.It seems that everyo

4、ne knows what has happened.It is a pity that you failed to pass the exam.3.主语从句也可以由疑问代词主语从句也可以由疑问代词(what,who,whom,which哪一个哪一个)和疑问副词和疑问副词(where,when,why,how)，或，或wh-ever类疑问词引类疑问词引导。导。What colours meant to early humans is little known to us.Who she will invite to her birthday party is not my concern.Wh

5、ere the next World Expo will take place is known to almost everyone.Where the next World Expo will take place is known to almost everyone.When the meeting will be held has not been decided yet.Why he gave up singing is of great interest to reporters.How the little boy got out of the cave remains a s

6、ecret.4.主语从句作主语往往被看作主语从句作主语往往被看作单数单数。When and why Jack came to Shanghai is not known.不知道杰克是什么时候和为什么来上海的。不知道杰克是什么时候和为什么来上海的。5.由疑问词引导的主语从句要保持由疑问词引导的主语从句要保持陈述语气。陈述语气。What we should do before the meeting is not clear.6.由疑问词引导的主语从句，同样可以用由疑问词引导的主语从句，同样可以用“it”作形式主语。作形式主语。It is pretty well understood what c

7、ontrols the flow of carbon dioxide in and out of the atmosphere.是什么控制着二氧化碳在空气中的含量在今天是是什么控制着二氧化碳在空气中的含量在今天是很好理解的。很好理解的。7.主语从句也可以由主语从句也可以由whether引导，用以引导，用以描述两种截然不同的可能性。描述两种截然不同的可能性。注意注意:1).if 也表示是否，可以引导宾语从句也表示是否，可以引导宾语从句,但但是主语从句，表语从句只能用是主语从句，表语从句只能用whether引导。引导。2)or not 通常可以直接跟在通常可以直接跟在whether后面，后面，或者

8、在主语从句中的宾语或宾语补足语或者在主语从句中的宾语或宾语补足语后面，或者省略。后面，或者省略。Whether we can solve this problem remains unknown.Whether this material can be used in our factory has not been decided yet.Whether people who choose red on the test are energetic or not has been studied by a Swiss psychologist.Whether or not peoples p

9、ulse rates decrease when they see blue has aroused interest.Whether students need to go to school tomorrow will be announced on the radio.Exercises主语从句跟踪练习主语从句跟踪练习 很明显，她们确实是双胞胎，她们的脸型很明显，她们确实是双胞胎，她们的脸型很相似。很相似。_ was clear from the facial resemblance between them.That they were twins 毫无疑问她考试成绩会很好。毫无疑问她

10、考试成绩会很好。It is certain _that she will do well in her exam.很可能他把一切都告诉她了。很可能他把一切都告诉她了。_ that he told her everything.It is probable/likely 据报道中国又成功地发射了一颗人造地球据报道中国又成功地发射了一颗人造地球卫星。卫星。It is reported _that China has sent another man-made earth satellite into orbit 众所周知众所周知,地球围绕太阳转。地球围绕太阳转。_ is known to all.

11、That the earth moves around the sun 我们下周是否去野餐还不确定。我们下周是否去野餐还不确定。_ is uncertain.Whether we will hold a picnic next week 物体在水中比在空气中轻，这是常识。物体在水中比在空气中轻，这是常识。_ that objects are lighter in water than they are in air.It is common knowledge 这对我们有害还是有利还得看一看。这对我们有害还是有利还得看一看。It remains to be seen _.whether it

12、will do us harm or good 留几个护士在这儿是很有必要的。留几个护士在这儿是很有必要的。_ that several nurses(should)stay.It is necessary 他是否加入我们，没有太大的差别。他是否加入我们，没有太大的差别。_ wont make too much difference.Whether he will join usI.Complete the sentences：1.谁最先到将得到奖品。谁最先到将得到奖品。_ will receive a prize.2.你需要的是更多的经验。你需要的是更多的经验。_ is more exper

13、ience.Whoever comes in first What you need 3.我所有的东西请随便使用。我所有的东西请随便使用。_ is at your service.4.不管他想什么都没关系。不管他想什么都没关系。_ doesnt matter.5.这里说的话都应当保密。这里说的话都应当保密。_ must be kept secret.Whatever I have Whatever he thinksWhatever was said here 1._ leaves the room last ought to turn off the lights.A.Anyone B.Th

14、e person C.Whoever D.WhoCII.Choose the best answer:2._ broke the glass yesterday is not clear.A.Who B.when C.whether D.ThatA3._ he said at the meeting astonished everybody present.A.Why B.What C.When D.The matterB4._ has helped to save the drowning girl is worth praising.A.Who B.The one C.Anyone D.W

15、hoeverD5._ is still unknown.A.When he will come B.When will he comeC.When will come he D.He when will comeA 链接高考链接高考1._ was most important to her,she told me,was her family.（2008山东卷）山东卷）A.It B.This C.What D.As2._wants to stay in a hotel has to pay their own way.（2008浙江卷）浙江卷）A.Anyone B.The one C.Whoe

16、ver D.WhoCC3._ is known to us all is that the 2008 Olympic Games will take place in Beijing.（福建卷）（福建卷）A.It B.What C.As D.WhichB4.It has been proved _ eating vegetables in childhood helps to protect you against serious illnesses in later life.(2008上海卷上海卷)A.ifB.becauseC.when D.thatD 5._ matters most i

17、n learning English is enough practice.2007 全国卷全国卷II A.What B.Why C.Where D.Which6._ he referred to in his article was unknown to the general reader.2007 上海上海卷卷 A.That B.What C.Whether D.WhereAB7._makes this shop different is that it offers more personal services.(2008辽宁卷）辽宁卷）A.What B.Who C.Whatever D.Whoever8.parents say and do has a life-long effect on their children.(2007 陕西卷陕西卷)A.That B.Which C.What D.As9.It is none of your business other people think about you.Believe yourself.2007 福建卷福建卷A.How B.what C.which D.whenACBHomework Review “noun clause as subjects”,yourself after class.