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1、2015年学大教育艺考生课程语法 第四十八讲 主语从句适用学科英语适用年级高三年级适用区域人教版课时时长（分钟）60分钟知识点1.主语从句的概念结构式 2.主语从句的引导词3.It 作形式主语的主语从句 4.what与that引导主语从句的区别教学目标让学生了解主语从句的用法，并会用正确的运用主从连接词教学重点1.主语从句的引导词2.It 作形式主语的主语从句 教学难点what与that引导主语从句的区别教学过程 一、课堂导入课前练习：1、It is still under discussion _the old bus station should be replaced with a mo
2、dern hotel or not. Awhether Bwhen Cwhich DWhere2、It is by no means clear _ the president can do to end the strike.Ahow Bwhich Cthat Dwhat3、_ is surprising is that there are so many Chinese restaurants in Toronto.AIt BThat CSuch DWhat答案与解析：1、【答案】A 【解析】解析：whether“是否”句意：旧车站是否要被现代化的旅馆所代替仍在讨论中。2、【答案】D 【解
3、析】本题考查it作形式主语，空格后是一个主语从句，从句部分的动词do缺少宾语，此处所填单词既要引导主语从句，又在从句中作宾语，四个选项中有此功能的只有what。句意：总统能采取什么措施来结束这场罢工根本不为人所知。 3、【答案】D 【解析】考查主语从句。句意：令人吃惊的是，在多伦多有这么多中国饭店。“What is surprising”是主语从句，What在从句中作主语。2、 复习预习教师出示上节课预留的练习题，针对上节课的作业进行讲评、订正、答疑，根据学生实际情况进行讲解分析；以提问、回顾的形式引导学生复习上节课内容；讲上面那三个题导入本节课所要学习的主语从句。 三、知识讲解知识点1 一、
4、 主语从句的概念及结构式（1） 概念：在复合句中充当主语成分的句子。（2） 位置：位于句首： +谓语动词（+宾语）That he finished writing the composition in such a short time surprised us all.用it作形式主语，真正的主语从句置于句末： It is +adj./v.ed/名词词组+ +从句 Its none of your business where I will spend my summer holiday.知识点2 ：主语从句的引导词一） that引导的主语从句（1） 由连词that引导的主语从句:引导词th
5、at无含义/在句中不做成分/不可以省。例如：That you will win the medal seems unlikely.你能得奖看起来不大可能。 That light travels in straight lines is known to all. 众所周知，光沿直线传播。 That you dont like him is none of my business.你不喜欢他不管我的事。（2）形式主语it替代主语从句位于句首，that引导真正的主语从句会放到句子二）用连词 whether/if 引导的主语从句 Whether/if有含义“是否”在句中不做成分/不可以省。注意：主语
6、从句置于句首时，不能用if，只能用whether。例如：Whether you like him or not is none of my business.Whether we will hold a party in the open air tomorrow depends on the weather. Whether she is coming or not doesnt matter too much.三）用连接代词引导的主语从句 在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引
7、导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分.例如：What you need is more practice. What I want to know is this. Whatever we do is to serve the people.注：whatever, whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。whatever = anything that; whoever = anyone who。要注意和whatever, whoever引导的让步状语从句的区别四）用连接副词引导的主语从句用连接副词when, where,
8、 why, how, whenever, wherever, however等引导的主语从句从句(其连接副词有含义,在句中作状语。)例如:Where we should leave it is a problem.When they will come hasnt been made pubic.温馨提示：如果主语从句是由连接代词what, whatever, whoever等引导的，表示的是一个具体的东西或人时，这样的主语从句不能用it作形式主语。What is worth doing is worth doing well.Whatever was said here has left u
9、s much too think.知识点3 ：It 作形式主语的主语从句 形式主语it替代主语从句位于句首，that引导真正的主语从句会放到句子的后面。常用的句式主要有如下几种：1.It+ 系动词+形容词+that从句。如：It is necessary that 有必要It is clear that 很清楚It is likely that 很可能It is important that 重要的是类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; cer
10、tain; evident; worth-while; surprising; interesting; astonishing, etc.例如： It was really astonishing that he refused to talk to you. It is essential that he should be here by the weekend. It seems obvious that we can not go on like this.It is necessary that you （should）master the computer. It is impo
11、rtant that a student learn English well. Its clear that they badly need help. It is likely that a hurricane will arrive soon.2、It +系动词 +名词+ that从句如：It is a fact that 事实是It is good news that 是好消息It is a question that 是个问题It is common knowledge that 是常识类似的名词还有：a pity；a wonder；a good thing； no wonder；
12、surprise等。例如：It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.Its a pity that you missed the film. 3. It +be +动词的过去分词+that从句如:It is said that 据说It is reported that 据报道It has been proved that 已证明It must b
13、e proved that 必须指出类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc.例如：It is thought that he is the best player. It is estimated that the vase is 2000 years old. It is said that he was killed in the ear
14、thquake. 4.It+特殊词+that从句如： It seems （happened / appears / doesnt matter / makes no difference / occurred ）that 如： It seems that they will win the game. It makes no difference whether he will attend the meeting or not. It does not matter if I missed my train.It happened that I saw him yesterday.知识点4： what与that引导主语从句的区别由what和that引导的主语从句what和that都可引导主语从句。what除起连接作用外,还在主语从句中充当某些成分(主语、宾语或表语)。而that在主语从句中不充当任何成分,只起连接词的作用。例如: What you said yesterday is right. 四、例题精析【例题1】_matters much _ the headmaster supports our activity.AIt; whet
