1、主语从句在复合句中，作主语的从句称为主语从句。一、主语从句的引导词及其在句中的功能(一)连接词that和whether观察例句1That she could come to help us made us very happy.2That the big earthquake had killed many people frightened people all over the world.3Whether we go by train or by boat makes no difference.4It is still unknown whether the plan will be
2、carried out.归纳用法1that引导主语从句，在从句中不充当任何成分，仅起连接作用，但不能省略。2whether引导主语从句，在从句中不充当任何成分，起连接作用，但有自己的意义，不可省略。名师点津whether引导的主语从句既可放在句首，也可放在句尾(前面需用it作形式主语)。(二)连接代词who，whose，whom，what，which，whichever，whoever，whomever，whatever等观察例句1Who will take his place is not important.2What role he will play in the film hasnt
3、 been known.3Whatever you do in your spare time should do no harm to others.归纳用法连接代词引导主语从句，并在从句中作主语、宾语或定语。(三)连接副词when，where，how，why等观察例句1Where the English evening will be held has not yet been decided.2When we will have a meeting is an important question.3Why John was late for the class has been une
4、xplained.归纳用法连接副词引导主语从句，并在从句中作状语。即学即练1单句语法填空It doesnt matter whether you pay in cash or by credit card in the store.What makes the book so extraordinary is the creative imagination of the writer.When the delayed flight will take off depends much on the weather.二、主语从句与形式主语it1It be名词词组主语从句常用于这种句型的名词词组
5、有a pity，a shame，a fact，an honour，a wonder，no wonder等。Its a pity (that)you cant attend my birthday party.很可惜你不能参加我的生日聚会。Its no wonder that she speaks English so well.难怪她英语说得那么好。2It be形容词主语从句It is obvious that the manager of the coffee shop was waiting for Li Fang to leave.很明显咖啡店的经理在等李方离开。It is very i
6、mportant that a student (should)learn English well.学生学好英语很重要。3It be过去分词主语从句Its suggested that the old man (should)go home to have a rest.建议这位老人回家去休息一下。It is said that that is where the famous singer was born.据说，那就是那位著名的歌星出生的地方。4It不及物动词(happen，seem，appear，etc.)主语从句It seems to me that you disagree to
7、the plan.在我看来，你好像不赞成这个计划。It happened to me that I had been away when he called.他打电话时，我正好不在家。5It及物动词宾语that从句It surprised him that they came to visit him suddenly.让他吃惊的是他们突然来看他。It worried her a bit that her hair was turning grey.她的头发在变白，这让她有点担心。即学即练2单句语法填空It remains to be seen whether the newly formed
8、 committees policy can be put into practice.It suddenly occurred to him that he had left his keys in the office.It is often the case that anything is possible for those who hang on to hope.三、主语从句的注意事项(一)从句的语序观察例句1Whichever of you gets here first will get the prize.2How he succeeded is still a puzzle
9、.归纳用法在任何情况下，主语从句都用陈述语序。(二)主谓一致观察例句1What they need are books.2What they need is love.3When they will start and where they will go have not been decided yet.4When and where the meeting will be held has not been decided.归纳用法1从句作主语时，后面的谓语一般用单数形式；但what和who引导的主语从句，后面的谓语应与作表语的名词在数上保持一致。2如果由and连接两个或两个以上的主语从
10、句作主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。即学即练3单句语法填空What you need is(be)more practice.What you need are(be)file folders for your stuff.When and where they had the party was(be)unknown.单句语法填空1Whether he can do it is a problem.2It makes no difference to me whether you like it or not.3Whoever does wron
11、g to his country or to the people deserves punishment.4Which charity they will go to has not been decided.5Why he turned down the invitation was not clear.6That the earth goes around the sun is known to us all.7What side effect this medicine has is not known to the patient.8It is still unknown wheth
12、er the medicine will be effective to human beings.9It is not clear how he got here without any money.10What she couldnt understand was that fewer and fewer students showed interest in science.完成句子1It is suggested that we (should)provide opportunities for employees to learn the latest technology.有人建议
13、我们应该给员工提供学习先进技术的机会。2It is a pity that we cannot solve the problem.很可惜，我们不能解决这个问题。3What we need to do is to think of new ways to improve the situation.我们需要做的是想出新办法来改善现状。4Where we will spend our holiday has not been decided.我们要去哪儿度假还没有决定。5Why he failed the biology exam isnt clear.他为什么没有通过生物考试还不清楚。6Who made the long distance call is not important.谁打的长途电话并不重要。7It is necessary that we (should)have breakfast我们吃早餐是有必要的。
