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1、Section Grammar 表语从句和主语从句语法图解探究发现My feeling is that theyre going to be big one day.But the big surprise of the evening was when I was elected prom queen!China is no longer what it used to be.The reason why Im calling you is that I want to invite you to my birthday party.That she has became an artist
2、 may have been due to her fathers influence.What we should do next remains unknown.Whether it will do us harm remains to be seen.Its a good thing that the exams are finished.我的发现(1)以上句中，句中黑体部分均引导表语从句，而句中黑体部分则引导主语从句。(2)由句可知，主语为名词reason时，表语从句中的连接词要用that，而不用why。(3)由句知，引导主语从句时，what要在从句中充当句子成分，而that不作任何成
3、分，只在语法上起连接作用。(4)句中，it用作形式主语，代替that引导的主语从句。一、表语从句1定义在复合句中作表语的从句，叫作表语从句。它位于主句的系动词之后，对主语进行解释、说明，使主语的内容具体化。2引导词引 导 词用法例句从属连词that，whether (不能用if)在从句中不作成分，that没有实际意义，不可省略；whether意为“是否”The trouble is that I have lost his address. 麻烦是我把他的地址丢了。The point at issue is whether we go to the party.争论点是我们是否去参加聚会。be
4、cause说明主语所表示的事件发生的原因，意为“因为”He has heart disease. That is because he has been smoking too much. 他有心脏病。那是因为他抽烟太多。as if/though从句表示的情况发生的可能性较小时常用虚拟语气It seems as if he doesnt know the answer. 他好像不知道答案。连接代词who(ever)，whom(ever)，whose，what(ever)，which(ever)等在从句中作主语、宾语、表语、定语等Every year, whoever makes the mos
5、t beautiful kite will win a prize in the Kite Festival. (2017北京高考)每年，在风筝节上风筝做得最漂亮的人将赢得一份奖品。连接副词when，where，why，how等在从句中作状语，表示时间、地点、原因、方式等The last time we had great fun was when we were visiting the Water Park. 我们最后一次开心地游玩是我们参观水上公园的时候。即时演练1用适当的连接词填空My opinion is that we should communicate with parents
6、 frequently.The problem is whether we can find them there.This is what I should have done first of all.This is where I dont agree with you.The question is how we can get in touch with him.The problem is who will come to replace her.This is because it is raining outside.3注意事项(1)that与what的区别that引导表语从句
7、时，是连词，在从句中不作成分；what是连接代词，引导表语从句时，在从句中作主语、宾语、表语或定语。That was what she did this morning on her way to school.那就是她今天早晨在去学校的路上做过的事。(2)because与why的区别because引导表语从句时强调原因，why引导表语从句时强调结果。She often comes late.Thats because she has a baby to take care of.她经常迟到。那是因为她有一个孩子要照顾。She has a baby to take care of.Thats
8、why she often comes late.她有一个孩子要照顾。那就是她经常迟到的原因。名师点津名词reason作主语时，后面的表语从句表示原因时要用that引导，而不用because。The reason why he was late is that it was raining hard.他来晚了是因为天正下大雨。即时演练2用that/what/because/why填空(2016北京高考改编)The most pleasant thing of the rainy season is that one can be entirely free from dust.This was
9、 what he told me.My belief is that I will succeed by working hard.I had neither a raincoat nor an umbrella.That is why I got wet through.You always make the same mistakes in the exams.I think that is because you are too nervous.(3)虚拟语气用于表语从句在表示建议、劝告、命令等含义的名词后的表语从句中，谓语动词用“should动词原形”，should可以省略。My su
10、ggestion is that we (should) have a discussion about this matter instead of just laying it aside.我的建议是我们应当讨论一下这件事，而不应该只是把它放在一边。as if/as though引导的表语从句常用虚拟语气。用一般过去时表示现在，过去进行时表示现在进行，过去完成时表示过去，could/would/might动词原形表示将来。It looks as if he were ten years younger today.今天他看起来好像年轻了10岁。即时演练3用所给词的适当形式填空The doc
11、tors advice is that we (should) take (take)more exercise.The proposal is that the school (should) enlarge (enlarge) the playground. 二、主语从句(一)主语从句的引导词连接词：that, if, whether；连接代词：what, who, whom, which, whose, whatever, whoever, whichever, whomever；连接副词：when, where, how, why等。It is very important wheth
12、er we can finish that task on time.我们能否按时完成任务很重要。It is certain that the film Wolf Warrior was a success.可以肯定的是电影战狼是一部成功的影片。Whichever of you comes in will receive a prize.你们当中不论哪个进来都将得到奖品。名师点津whether/if在从句中不充当句子成分，起连接作用，意为“是否”。whether引导的主语从句既可放在句首，也可放在句尾；if引导的主语从句只能放在句尾，前面用it作形式主语。如果whether引导的主语从句用it
13、作形式主语，whether可换成if。Whether life exists on other planets is not clear.其他星球上是否存在生命还不清楚。It is doubtful whether/if she would play the role.她是否要演这个角色还很难说。即时演练4完成句子Whether hell come here isnt clear.他是否会来这里还不清楚。That the earth turns around the sun is known to all.我们都知道地球围着太阳转。What will happen to the world i
14、s difficult to predict.世界将发生什么事情是难以预测的。Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。 Why he gave up the chance of studying abroad is unknown.他为什么放弃了出国学习的机会还不清楚。(二)注意事项1常用it作形式主语的句型(1)Itbe形容词(obvious, true, natural, surprising, good, wonderful, funny, certain等)that从句It is wonderful that all
15、 of you have passed the difficult exam.你们都通过了这么难的考试，真是太好了。名师点津在“Itbe形容词that从句”句型中，如果形容词为necessary, important, strange, natural等时，从句谓语动词常用“(should)动词原形”。It is important that we (should) build more hydroelectric power stations.我们建立更多的水力发电站是重要的。(2)Itbe名词词组(no wonder, an honour, a good thing, a pity, no surprise, etc.)that从句It is no wonder that she was so upset.难怪她如此心烦意乱。(3)Itbe过去分词(said, reported, thought, expecte
