Section Ⅲ Grammar —主语从句在主从复合句中，充当主语的从句，即为主语从句。
一、主语从句的连接词1．连接词that和whether(1)that在从句中不充当任何句子成分，只起连接作用，但不可省略。
①That Whitney Houston died upset her fans all over the world.惠特尼·休斯顿的离世令全世界的粉丝感到难过。
(2) whether在从句中不充当任何句子成分，起连接作用，意为“是否”，不可省略。
②Whether the plan will be carried out is still unknown.这个计划是否会实施还不知道。
即学即练11－1.完成句子①她能来帮助我们使我们很高兴。
_________________________ made us very happy.②他被选为(be chosen as)志愿者(volunteer)让我们感到高兴。
____________________________ made us happy.③我们明天是否举行派对取决于天气。
____________________________ depends on the weather.④(湖南高考)Everyone in the village is very friendly. It doesn't matter ________ you have lived there for a short or a long time.A．why B．HowC．whether D．when2．连接代词(who，whose，whom，what，which，whichever，whoever, whomever, whatever连接代词引导主语从句，在从句中可以作主语、宾语、表语或定语。
①Who will take his place is not important.谁将代替他并不重要。
②Whoever breaks the law should be punished. 无论是谁只要违法就应该受到惩罚。
3．连接副词(when, where, how, why等)连接副词引导主语从句并在从句中作状语。
③When we will have a meeting is an important question[点津] 主语从句中连接词的选择标准：ⅰ.根据连词在句子中所作的语法成分；ⅱ.根据连接词在从句中的意义。
2－1.用连接代词或连接副词填空并写出它们在从句中所作的语法成分①What role he will play in the film hasn't been known.______②Why John was late for the class has been unexplained._______③Which part of the country he will travel to needs discussing.____④Where cars will be parked in the future is a question.______⑤What surprises me most is that he is too proud._____⑥Whoever is interested in the activity can sign your name._______⑦(北京高考)____ makes the book so extraordinary is the creative imagination of the writer.A．That B．WhatC．Who D．Which⑧(上海高考)________ comes will be welcomed to the open-air concert.A．Whatever B．WhoeverC．No matter what D．No matter who二、主语从句中用it作形式主语的结构1．It＋be＋形容词(obvious, true, natural, strange, etc.)＋主语从句①It's obvious that they badly need help.很明显，他们急需帮助。
2．It ＋be＋名词词组(no wonder, an honour, a pity, a/no surprise, etc.)＋主语从句②It's a pity that you missed the film.你没有看那部电影真是太遗憾了。
3．It ＋be＋过去分词(said, reported，thought，expected，proved, etc.)＋主语从句③It is suggested that the meeting be put off.有人建议会议延期召开。
4．It＋不及物动词(happen, seem, appear, etc.)＋主语从句④It seems that it is going to rain.看起来好像要下雨。
5．It ＋及物动词＋宾语＋主语从句⑤It surprised him why they came to visit him suddenly.让他吃惊的是他们为什么突然都来看他。
即学即练33－1.完成句子①学生学好英语很重要。
___________________a student (should) learn English well.②我们队失掉了这场比赛真是意外。
_________________ our team lost the game.③已经得到证实，你说的是对的。
__________________ what you said is right.④碰巧那年收成不好。
__________________ the harvest was bad that year.⑤似乎他丢了什么东西。
____________________he has lost something.3－2.句型转换⑥That he suddenly fell ill last month surprised us.→________________he_suddenly_fell_ill_last_month.⑦Whether they will sell the house is not yet decided.→________________yet_whether_they_will_sell_the_house.⑧That the light travels in straight lines is known to us all.→_______________to_us_all_that_the_light_travels_in_straight_lines.⑨(陕西高考)It remains to be seen ________ the newly formed committee's policy can be put into practice.A．that B．WhichC．what D．whether⑩(江西高考)It suddenly occurred to him ________ he had left his keys in the office.A．whether B．WhereC．which D．that⑪(江苏高考)It was never clear ________ the man hadn't reported the accident sooner.A．that B．HowC．when D．why三、主语从句中应注意的问题1．从句要用陈述语序①How he succeeded is still a puzzle.他是如何成功的仍然是个谜。
2．主谓一致(1)从句作主语时，主句的谓语一般用单数形式。
②Where he will get a job after graduation has puzzled him much.毕业后到哪儿找份工作使他很困惑。
[点津]what引导主语从句时，有时主句谓语动词应与主句中作表语的名词保持一致。
③What the school needs much are books.这所学校最需要的是书。
(2)如果由and连接两个或两个以上的主语从句作主语时，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。
④When they will start and where they will go have not been decided yet.他们将在什么时候动身以及要去哪里还没定下来。
即学即练4 单句改错①When will we set off is still under discussion.__________②What he needs much are money.___________③When and where the meeting will be held have not been decided.__________④What can we not get seems better than what we have.____________⑤That the coal workers are still alive are a wonder.____________Ⅰ.用适当的连接词填空1．It is a pity _____ we can't go to see the movie on the weekend.2．They lost their way in the forest and ____ made matters worse was ___ night began to fall.3．________has helped to save the people in difficulty is worth praising.4．It doesn't interest me _______you succeed or not.5．_______ Zhai Zhigang ate his food in space is _______ we want to know.6．___they will have the sports meeting is still a question, for they have so many things to do.7．____ they will talk about the matter won't make too much difference. In fact, it is the attitude not the place that matters.8．______he didn't come yesterday is unknown.9．_______ one is better will be decided by yourself.10．_______ will be our English teacher in the new term hasn't been decided yet.Ⅱ.完成句子1．____________(据报道) some people stole others' money by ATM.2．______________________(她生了一个健康的男婴) made the family very happy.3．________________ (父母是否给他买一个新的MP3) depends on his exam results.4．________________(那是谁的包) was not known at that time.5．It remains a mystery________dinosaurs_suddenly_disappeared (为什么恐龙突然消失了)．Ⅰ.单项填空1．________ the universe began with the “big bang” has bee n widely accepted.A．Whether B．WhyC．That D．What2．________ he would like to offer his help or not makes no difference to me.A．That B．WhatC．Whether D．If3．It has been proved ________ having a balanced diet helps to keep healthy.A．if B．BecauseC．when D．that4．________ was not the way the event happened.A．Which the press reportedB．That the press reportedC．What did the press reportD．What the press reported5．________ is a fact that English is being accepted as an international language.A．There B．ThisC．That D．It6．—Mary looks down today.What is the matter?—Well，________ happened between Mary and me is none of your business.A．wherever B．WhoeverC．whatever D．whichever7．________ their flight will arrive on time is ________ they are concerned about.A．Whether; what B．Whether; thatC．When; what D．How; that8．________ matters most in learning English is enough practice.A．What B．WhyC．Where D．Which9．When and why he came here ________ yet.A．is not known B．are not knownC．has not known D．have not been known10．It is none of your business ________ other people think about you.Believe yourself.A．how B．WhatC．why D．WhenⅡ.用适当的连接词填空Everyone knew __1__ Wendy was a famous writer, but no one knew __2__ she came from and __3__ she was born in 1961 was still a mystery. __4__ they did know was __5__ she was loved by poor people because she always helped __6__ was in need of money. Wendy was generous and helpful, but some people thought she was chasing fame. Wendy said she didn't understand__7__ they were so narrow-minded, but it didn't matter __8__ others thought of her. She just wanted to do __9__ she thought was right. I think that is __10__ the meaning of life lies. 答案：1.that 2.where 3.whether 4.What 5.that 6.who(ever)7.why8.what 9.what(ever)10.where。