主语从句和表语从句
表语从句与主语从句
表语从句与主语从句表语从句和主语从句以及宾语从句都要用陈述语序。
Ⅰ.表语从句在复合句中，位于系动词之后作表语的从句称为表语从句。
它位于主句的系动词之后，最为重要的是我们应该为牛找到足够的水。
The doubt is who has taken away the valuable vase. （主语，人）疑点是谁拿走了那只贵重的花瓶。
My topic today is what most scientists are researching.（宾语，物，没有选择范围）我今天的话题就是大多数科学家正在研究的课题。
The problem is which school will be chosen.(which在从句中作定语)问题是哪一所学校将被选中。
All this was over twenty years ago，but it’s as if it was only yesterday.这都是20多年前的事了，但宛如昨天一样。
表语从句中应注意的问题(1)because，why引导的表语从句。
because引导表语从句时，表示“因为”，why引导表语从句时，表示“……的原因”，相当于the reason why。
That’s because he didn’t understand me. (That’s because...强调原因)那是因为他不理解我。
That’s why he got angry with me. (That’s why...强调结果)那正是他对我生气的原因。
(2)what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because。
What cost him his life was that he was too careless.使他丧命的原因是他太粗心了。
The reason why I was sad/for my being sad was that he didn’t understand me.我难过的原因是他不理解我。
中的表语从句与主语从句的区别与联系总结
中的表语从句与主语从句的区别与联系总结表语从句与主语从句是英语语法中常见的两种从句结构。
它们在句子中起到不同的作用，有着一定的区别与联系。
本文将对表语从句与主语从句的概念、用法以及区别与联系进行总结。
一、表语从句的概念与用法表语从句是由一个句子充当另一个句子的表语，对主句的主语或者宾语进行补充或说明。
通常使用连词"that"来引导表语从句。
表语从句常常出现在be动词（is、am、are、was、were等）后面，也可以出现在感官动词（feel、look、seem等）后面。
如：1. My dream is that I can travel around the world.（我梦想环游世界。
）2. He looks like he is in a bad mood.（他看起来心情不好。
）从以上例子可以看出，表语从句是对主句的主语或宾语进行补充或说明，常常使用连词"that"来引导。
二、主语从句的概念与用法主语从句是在句子中充当主语的从句结构。
它的引导词有很多种，如that、whether、wh-引导的词（who、what、when、where等）等。
主语从句可以说是句子的主体，它所描述的是句子表达的核心内容。
如：1. That he won the championship surprised everyone.（他赢得冠军让大家惊讶。
）2. Whether we can go camping is dependent on the weather.（我们能否去野营取决于天气。
）从以上例子可以看出，主语从句在句子中充当主语的角色，描述的是句子的核心内容，常常使用引导词that、whether、wh-引导的词等。
三、表语从句与主语从句的区别1. 结构不同：表语从句常常使用连词"that"来引导，而主语从句的引导词有多种变化。
2. 位置不同：表语从句通常出现在be动词后面，充当be动词的补足语；而主语从句作为整个句子的主体，位于句首位置。
主语从句和表语从句的复合句例子
主语从句和表语从句的复合句例子复合句是由一个主句和一个或多个从句构成的句子。
主语从句和表语从句是复合句的两种常见类型。
主语从句用作主句的主语，而表语从句用作主句的表语。
它们在句子中起到不同的语法作用。
下面将通过多个例子来说明主语从句和表语从句的用法和语法结构。
1. 主语从句的例子（1）“What he said”是主语从句作为整个句子的主语。
例句：What he said is true.翻译：他说的是真的。
（2）“Whether they will come or not”是主语从句作为整个句子的主语。
例句：Whether they will come or not is still uncertain.翻译：他们是否会来还不确定。
（3）“Who will win the game”是主语从句作为整个句子的主语。
例句：Who will win the game remains to be seen.翻译：谁会赢得这场比赛还有待观察。
2. 表语从句的例子（1）“That he is a doctor”是表语从句作为主句的表语。
例句：My brother's dream is that he is a doctor.翻译：我弟弟的梦想是他成为一名医生。
（2）“What she said”是表语从句作为主句的表语。
例句：The fact is what she said is true.翻译：事实就是她所说的是真的。
（3）“Whether it is right or wrong”是表语从句作为主句的表语。
例句：The question is whether it is right or wrong.翻译：问题是对错。
3. 主语从句和表语从句的区别主语从句和表语从句的区别在于它们所起的作用。
主语从句作为整个句子的主语，相当于一个名词短语，而表语从句则作为主句的表语，描述或补充说明主语的特征或状态。
主语从句和表语从句的用法解析
主语从句和表语从句的用法解析名词性从句（主语从句、表语从句、宾语从句、同位语从句）主语从句、表语从句、宾语从句和同位语从句在复合句中的充当的成分和其名称相同，分别作主句的主语、表语、宾语和同位语。
上述这四种从句均被称为名词性从句。
所有的名词性从句均不能用逗号分开，并且它们都用相同的关联词，关联词如下：① 主从连词：that (无意义), whether (是否), if (是否)（在句子中不充当任何成分）② 连接代词：who (谁), whom (谁), whose (谁的), what (什么), which (哪一个)③ 连接副词：when (什么时候), where (什么地方), how (怎样), why (为什么)主从连词只起连接作用，连接代词和连接副词除了起连接作用外，还充当从句某一个成分。
另外，能够用whatever, whichever, whoever, who(m)ever等连接代词引导名词性从句，来增强语气。
（一）主语从句（subject clause）在主句中用作主语的主谓结构称之为主语从句。
例如：That he will come to the discussion is certain.他来参加讨论是确定的。
That the moon moves round the earth is well known to all of us.月球绕地球转动，这是我们大家都熟知的。
When the meeting is to be held has not yet been decide. 会议什么时候召开还没有决定。
主语从句放在句首，句子常常显得比较笨重，所以通常能够把it放在句首，作形式主语，而将主语从句放在后面。
例如上面的句子能够分别改写为：It is certain that he will come to the discussion.It is well known to all of us that the moon moves round the earth.It has not yet been decide when the meeting is to be held.下面再举一些例句：What they are after is profit.他们追求的是利润。
主语从句、表语从句
主语从句在句子中担当主语的是一个从句，这个从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
主语从句使用陈述语序，其通常结构为“引导词+ 主语+ 谓语+ 其他成分”；但当连接代词同时充当从句主语时，其结构为“连接代词+ 谓语+ 其他成分”。
一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。
1. that引导例句：That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
2. whether引导例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导例句：Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
4. 连接副词引导例句：How this happended is not clear to anyone. 这件事怎样发生的，谁也不清楚。
5. 关系代词型what引导例句：What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。
二、主语从句与形式主语it有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。
这分三种情况：(1) 对于以连词that引导的主语从句，通常用形式主语代主语从句：例句：That they should refuse to sign the petition required great courage. 他们拒绝在请愿书上签字这是需要很大勇气的。
(2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
中的表语从句与主语从句总结
中的表语从句与主语从句总结表语从句与主语从句是汉语语法中常见的句型结构，它们在句子中担任不同的成分，有着各自的特点和用法。
本文将对中的表语从句与主语从句进行总结，以帮助读者更好地理解和运用这两种从句。
一、表语从句表语从句是句子中充当表语的从句，用来说明或补充主句的主语或宾语。
在句子中，常常由一些特定的动词或形容词引导。
1. 动词引导的表语从句一些动词后面可以跟一个从句作为它的表语，例如：是、成为、被、叫做等。
例如：他是一个优秀的学生。
（表语从句在系动词“是”后面）她成为了一名医生。
（表语从句在动词“成为”后面）2. 形容词引导的表语从句一些形容词可以跟一个从句作为它的表语，例如：重要的、必要的、可能的等。
例如：休息好对身体是重要的。
（表语从句在形容词“重要的”后面）帮助别人是值得提倡的行为。
（表语从句在形容词“值得提倡的”后面）二、主语从句主语从句是句子中充当主语的从句，用来说明或描述主句的主语。
在句子中，常常由一些特定的词引导。
1. 连词引导的主语从句一些连词可以引导一个从句作为主语，例如：谁、什么、哪里等。
例如：谁来捣乱的还不清楚。
（主语从句由连词“谁”引导）什么是成功的关键？（主语从句由连词“什么”引导）2. 从句引导词引导的主语从句一些从句引导词可以引导一个从句作为主语，例如：怎样、为什么、无论等。
例如：无论他说什么，我都不会相信他。
（主语从句由从句引导词“无论”引导）为什么他会辞职，我始终不明白。
（主语从句由从句引导词“为什么”引导）总结：表语从句和主语从句在句子中的作用不同，但它们都是由从句组成的，并且在语法上有着一定的共性和特点。
表语从句常常在系动词后面，用来作为主句的补充说明，它一般由一些特定的动词或形容词引导。
主语从句常常在句子的主语位置，用来说明或描述主句的主语，它可以由一些连词或从句引导词引导。
在使用表语从句和主语从句时，需要注意从句的位置和从句引导词的使用，以确保句子的语义和语法的准确性。
主语从句和表语从句
主语从句和表语从句主语从句和表语从句知识点1.名词性从句引导词的选择选择原则“缺什么，补什么，什么不缺，用that”“什么不缺，用that”的意思是：如果从句中不缺任何成分，而且句意完整时，就用that来引导主语从句或表语从句以及其他的名词性从句。
2.whether 意为“是否”，引导的主语从句放在句首，不能用if 代替；但当用it 作形式主语时，whether引导的主语从句放在句中或句末，此时可换用if. It is doubtful whether there’ll be any seats left.说不上是否还有座位了。
3.that 引导主语从句时，只起连接作用，不作任何成分，没有实际意义。
在句首时不可省略。
What引导主语从句时既要起连接作用，又要在从句中作主语或宾语，在任何情况下都不能省略，它具有具体意义，表示“什么，所……的（事、物、话）”，相当于all that/ everything that. Which 引导主语从句也作成分，它表示选择的意义，常译为“那个”。
如：That he survived in the earthquake is a miracle. 他在地震中幸免于难，这是个奇迹。
4.关系代词what, which, who引导主语、表语从句时含有疑问意义，而whatever,whichever, whoever在引导名词性从句时，往往比what, which, who更强调，不表示疑问意义。
而且whatever=all that/everything that; whichever=anything that;whoever=anyone who.另外，whatever=no matter what时引导状语从句。
如：Whatever is worth doing at all is worth doingwell.凡是值得做的事情都值得好好地做。
I语法填空。
使用正确连接词补全下列句子。
主语从句 表语从句
❖ It +be +-ed+ that从句 It is said that Mr. Green has arrived in Beijing. It is reported that China has sent another manmade earth satellite into space. 常见：It is well known that… It is believed that… It is thought that… It is understood that… It is announced that… It is suggested that… …
名词：suggestion, order, requirement, desire, demand, proposal, request, advice, insistence, command
-ed: suggested, ordered, required, desired, demanded, proposed，requested, advised, recommended
I heard (that) he has joined the football club.
That light travels in a straight line is known to all. 连词whether和if有意义（是否），在从句中不可省略。
I didn’t know whether/if he would attend the concert. ❖ 连接代词 who, whom, whose, what, which, whoever, whomever, whosever, whatever, whichever在从句中有各自的意义，在从句中可作主语、 宾语、定语和表语。
高中语法辨析主语从句与表语从句
高中语法辨析主语从句与表语从句在英语语法中，从句是一个重要的概念。
主语从句和表语从句是两种常见的从句类型，在句子中分别作为主语和表语的成分。
本文将对主语从句和表语从句进行辨析，并给出一些实例以帮助读者更好地掌握这两种从句的用法。
一、主语从句主语从句在句子中充当主语的角色，它由连词引导，谓语在从句之后。
常见的引导主语从句的连词有：that, whether, if, who, what, which 等。
下面是一些主语从句的例子：1. Whether he will come to the party is still unknown.是否他会来参加派对还不确定。
2. What she said is completely true.她说的是完全正确的。
3. Who will be responsible for the project remains to be decided.谁将负责这个项目仍有待决定。
从这些例子可以看出，主语从句可以很好地起到句子的主语作用，引导词可以根据具体语境来选择，例如whether用于引导一个陈述性主语从句，what用于引导一个宾语从句等。
二、表语从句表语从句在句子中充当表语的角色，它用来描述或说明主语的身份、特点、状态等。
常见的引导表语从句的连词有：that, whether, if, who, what, which等。
下面是一些表语从句的例子：1. The important thing is that you try your best.重要的是你尽力而为。
2. It doesn't matter who will come with us.谁跟我们一起来并不重要。
3. The question is whether we should continue or not.问题是我们是否应该继续下去。
从这些例子可以看出，表语从句用来对主语进行补充说明，起到强调、解释、评价等作用。
表语从句与主语从句
表语从句与主语从句表语从句和主语从句以及宾语从句都需要使用陈述语序。
一、表语从句表语从句是指在复合句中，位于系动词之后作表语的从句。
它对主语进行解释、说明，使主语的内容更具体化。
引导表语从句的引导词主要有以下几类：1.that和whether，它们通常不能互换，两者在从句中都不作成分，that无实义，whether意为“是否”。
2.连接who、whose、what、which等代词，在从句中作主语、宾语、表语、定语等。
3.连接when、where、why、how等副词，在从句中作时间、地点、原因、方式状语等。
4.because，主句主语一般不用reason连接词。
5.as if/though从句情况发生的可能性较小时常用虚拟语气。
例如：最重要的是我们应该为牛找到足够的水。
疑点是谁拿走了那只贵重的花瓶。
我今天的话题就是大多数科学家正在研究的课题。
问题是哪一所学校将被选中。
这都是20多年前的事了，但宛如昨天一样。
在表语从句中应注意以下问题：1.当because引导表语从句时，表示“因为”，而why引导表语从句时，表示“……的原因”，相当于the reason why。
2.That’XXX…强调原因，而That’s why…强调结果。
That was the reason he was angry with me.XXX.He lost his life because he was too careless.The cause of his death was his lack of n.The reason for my sadness was his XXX.I XXX.XXX ignoring it.I propose that we have a n about this issue rather than dismissing it.XXX XXX.XXX XXX.Whether we should go or not is still undecided.It is still undecided if we should go or not.What impressed me the most in the movie was the XXX.2.Sometimes。
主语从句&表语从句
Complete the sentences using what, whether, where, when， who, why, how or that.
Whatis needed for success) is your hard work. 1.(_____ When/How 2.(______ they will arrive )has been told to the teacher. Where/whether/how 3.(_____ we will go tomorrow )hasn’t been decided yet. 4.(______ Who can join in the sport meet) is decided by the teacher. 5.(________ Whether it will rain or not) is not clear.
3) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起…
It happened that 刚好)I came into the office *________________( at that time.
*____________________( It occurred to me that 我突然想起)I forget to sent the letter.
Conclusion: 主语从句作主语时，谓语动词一般用单数形式。
主语从句的规律： 找出下列句子中的错误，并总结规律 例1.When will he come is not known.
正：When he will come is not known. 规律一、主语从句一律用陈述语序， 即主语在前，谓语在后。
主语从句和表语从句
• 5)当reason做主语的时候，表语从句 当 做主语的时候， 做主语的时候 用that
1. The question is ________ we will have our sports meet next week. A. that B. if C. when D. whether 2．The reason why he failed is ________he was too careless. A. because B. that C. for D. because of 3. Go and get your coat. It’ s ________you left it A. where B. there C. there where D. where there
4. ___ leaves the room last ought to turn off the light. [高考真题 高考真题] 高考真题 A. Anyone B. The person C. Whoever D. Who
答案是C。“谁最后离开房间应关 答案是 。 意为“ 灯。”whoever意为“无论谁”, 引导主语 意为 无论谁” 从句, 并在从句中作主语。若选A或 从句 并在从句中作主语。若选 或B, anyone或the person 后应用 后应用who, 使其成为 或 引导的定语从句, 由who引导的定语从句 修饰 引导的定语从句 修饰anyone 或 person. 这些词还可引导副词性从句。 注：这些词还可引导副词性从句。
他们急需帮助，这是十分明显的。 他们急需帮助，这是十分明显的。 但是这类句子在大多数情况下会放到整 个句子的后部去，而用代词 作形式主语 作形式主语。 个句子的后部去，而用代词it作形式主语。
从句的种类与结构详细解析
从句的种类与结构详细解析从句是复句结构中的一种重要成分，它由一个主句和一个从句组成。
从句可以表达各种关系，功能上相当于其他句子成分。
本文将详细解析从句的种类与结构，以帮助读者更好地理解和运用从句。
一、名词性从句名词性从句在句子中充当名词的角色，可以分为主语从句、宾语从句和表语从句三种类型。
它们的结构和功能如下：1. 主语从句主语从句作为句子的主语，通常由连词“that”引导。
例如：“That he didn't show up at the meeting surprised everyone.”这个例句中，“that he didn't show up at the meeting”就是一个主语从句，它充当了整个句子的主语。
2. 宾语从句宾语从句作为句子的宾语，通常由连词“that”引导，也可以省略。
例如：“I believe that he will succeed in the future.”这个例句中，“that he will succeed in the future”就是一个宾语从句，它充当了整个句子的宾语。
3. 表语从句表语从句用于说明主语的身份、特征等，在句中充当了表语的角色。
例如：“My biggest fear is that I will fail the exam.”这个例句中，“that I will fail the exam”就是一个表语从句，它充当了整个句子的表语。
二、形容词性从句形容词性从句用来修饰名词，充当形容词的角色。
它可以由关系代词和关系副词引导。
具体结构如下：1. 关系代词引导的形容词性从句关系代词有“that, which, who, whom, whose”等，用来引导形容词从句并在从句中充当句子成分。
例如：“The man who is talking to my sister is a doctor.”这个例句中，“who is talking to my sister”就是一个由关系代词引导的形容词性从句，修饰了前面的名词“man”。
高中英语语法：表语从句以及主语从句分析
高中英语语法：表语从句以及主语从句分析英语的语法一直是一个非常重要的成分，是英语学习汇总必不可少的一个基石，在高中英语的学习中，如果能够掌握一个比较全面熟练的语法知识体系，在后续的英语学习过程中会非常容易并且游刃有余，今天就让我们一起来学习关于高中英语语法中的：表语从句以及主语从句吧。
一、表语从句1.定义：用作表语的从句叫做表语从句。
2.构成：关联词+简单句3.引导表语从句的关联词的种类：(1)从属连词that。
如：The trouble is that I have lost his address.麻烦是我把他的地址丢了。
(2)从属连词whether,as,as if。
如：He looked just as he had looked ten years before.他看起来还与十年前一样。
The question is whether they will be able to help us.问题是他们是否能帮我们。
注：从属连词if一般不用来引导表语从句，但as if却可引导表语从句，如：All this was over twenty years ago,but it's as if it was only yesterday.这都是20多年前的事了，但宛如昨天一样。
能跟表语从句的谓语动词一般为系动词be,seem,look等。
如：It looked as if itwas going to rain.看起来天要下雨了。
(3)连接代词who,whom,whose,what,which,whoever,whatever,whichever 连接副词where,when,how,why。
如：The problem is who we can get to replace her.问题是我们能找到谁去替换她呢。
The question is how he did it.问题是他是如何做此事的。
主语、表语从句
名词性从句专题一主语从句、表语从句一、主语从句1.定义：在复合句中充当主语成分的句子。
2.位置：主语从句通常放在主句谓语动词之前或由形式主语it代替，而从句本身放在主句后面。
3.主要知识点：（1）引导词：主语从句由从属连词that,whether等，连接代词what,whatever,which,who等，以及连接副词how,when,why,where等引导.（2）常见用法及考点：①主语从句通常放在主句谓语动词之前，而从句本身放在主句后面。
例句分析：That everything in the world changes was often a theme in poetry of the Romantic Movement. 世界上万物都是变化的，这通常是浪漫主义运动诗歌中的主题。
What the Mayans are most famous for art their palaces and their pyramid-temples.玛雅最著名的是他们的宫殿和金字塔庙。
That he will come to the party is certain.他会来参加派对是可以肯定的。
注：that/what的区别：what有一定的意义，表示“什么，…..的东西”，相当于the things which，that只起连接作用，没有任何意义。
②由形式主语it代替，而从句本身放在主句后面。
例句分析：It is well-known that many Americans like to eat a lot.众所周知，许多美国人很喜欢吃。
通常在口语或非正式文体中，that常可省略，但必须是在用先行词it的情况下，如：It’s a pity (that) you are leaving.③由wh-疑问词引导：从句既可以前置，又可以借助于先行词it后置。
Who cleaned the meeting room is unknown.不知道是谁打扫了会议室。
中的表语从句与主语从句的区别与联系
中的表语从句与主语从句的区别与联系表语从句与主语从句是英语中两种常见的从句结构。
它们在语法形式和句子结构上有一些区别和联系。
本文将从这两个方面进行探讨。
一、表语从句与主语从句的区别1.语法位置：表语从句通常出现在系动词后面，用来作为主语或宾语的补足语。
例如：- My dream is that I can travel around the world one day.- The fact is that she has won the competition.主语从句出现在句子的主语位置，用来作为主语。
例如：- What he said is true.- Whether she will come to the party is still uncertain.2.引导词：表语从句使用了连词"that"引导，后接完整的句子。
例如：- The teacher said that it would rain in the afternoon.主语从句可以使用不同的连词引导，包括"that"、"whether"、"if"等。
例如：- Whether we can pass the exam is not certain yet.3.语序变化：在表语从句中，如果主句主语和从句主语指代同一人或物，通常不再重复主语。
例如：- His hope is that the team can win the championship.而在主语从句中，从句的主语往往需要与主句的主语指代相同，不能省略。
例如：- That she loves ice cream makes me happy.二、表语从句与主语从句的联系1.意义相似：表语从句和主语从句都能够充当句子的核心，发挥着重要的语义作用。
2.引导词重复使用：虽然表语从句和主语从句的引导词有所不同，但在某些情况下，它们可以互换使用，表达相同的意思。
中职英语：主语从句与表语从句
Unit 7主语从句与表语从句一、主语从句主语从句是在复合句中担任主语的句子。
其特点有：（1）引导词：从属连词that, whether；连接代词who, what, which；whoever, whatever, whichever;连接副词when, where, how和why。
（2）语序：陈述句语序（3）在主语从句中只能用whether，不能用ifThat he will win the match is certain.It is certain that he will win the match.1. 一般来说主语从句都是放在句首，但有时为了使句子保持平衡，避免"头重脚轻"，常用it作形式主语，从而把主语从句放后面。
常以it作形式主语的句型有：①It is＋形容词＋that...It is certain that she will do well in her exam.毫无疑问她考试成绩会很好。
②It is＋名词词组(no wonder，an honour，a good thing，a pity，no surprise，common knowledge，a surprise，a fact，etc. )＋that...It’s a pity that we can’t go.很遗憾我们不能去。
③It is＋过去分词(said，reported，thought，expected，decided，announced，arranged，etc. )＋that...It has been suggested that much should be done to prevent the river from being polluted.有人建议应做更多的工作阻止河流遭受污染。
④It appears/seems that...|It happens that...|It occurred to me that...|It turned out that...It turned out that nobody remembered the address.结果发现没人记得这地址。
主语从句和表语从句课件
主语从句和表语从句课件主语从句和表语从句是我们在学习中常常会遇到的两种从句类型。
它们在句子中分别担任主语和表语的角色，在起句子衔接和表达的作用上起到关键作用。
下面我将分别介绍主语从句和表语从句的基本定义、结构和用法，并给出一些例句来帮助读者更好地理解和运用。
一、主语从句主语从句是在一个句子中充当主语的从句。
它由一个从属连词引导（如that, whether, if, who, what, which, whose, whomever 等），后面跟一个完整的句子。
主语从句常见的结构有以下几种：1.从属连词+陈述句（陈述句类从属连词有that、whether）例如：- That you are here is a great relief.（你在这里是个巨大的安慰。
）- Whether he will come or not is uncertain.（他会不会来还不确定。
）2.从属连词+疑问句（疑问句类从属连词有what, who, which, whom, whose, when, where, why, how等）例如：- What he said is very important.（他说的话非常重要。
）- Who will be chosen is still unknown.（谁会被选中还不确定。
）- Where we will go for vacation is still undecided.（我们去哪儿度假还没决定。
）主语从句在句子中扮演着主语的角色，常常与it代词一起出现，而它自身又是一个完整的句子，所以我们可以把it看作是主语从句的形式主语。
例如：- It is important that we protect the environment.（保护环境是重要的。
）另外，在使用主语从句时还需要注意以下几点：1.主语从句常常出现在“It + be + adj. + that从句”这种句型中，在这种情况下要特别注意主谓的一致性。
主语从句,表语从句
A.主语从句 定义：在句子中担当主语的是一个从 句，这个从句就叫做主语从句。
B.主语从句是在复合句中充当主语的从句，通常 放在主句谓语动词之前或由形式主语it代替，而本 身放在句子末尾。
C.由于主语从句一般被认为是单数形式，形式主 语的谓语动词、be动词+表语 均为单数第三人称 形式或过去式.
5.Whenever you want to come is fine with me. 你什么时候想来我都欢迎。
6.Wherever you find high wages, you will generally find high prices. 哪里有高工资，哪里一般就有高物价。
7.How many people we are to invite is still a question． 邀请多少人还是一个问题。
（2） 连接代词引导主语从句
• 连接代词有：who（谁）， whoever（无论 谁）， whom （谁）， whose（谁的）， what（什么） whatever（无论什么）， which（哪个） ， whichever（无论哪个）等
例句：
1.Whoever is top from wins the game when two matched players meet. 两强相争勇者胜.
句型区别
1.That is why... “这就是……的原因/因此……”指 由于各种原因所造成的后果。
例句：That is why I came. 这就是我来的原因。
2.That is because...“这就是为什么……/因为……” 指原因或理由。
注意：连词that的省略问题
• 引导主语从句的连词that 有时可省，有时不能省， 其原则是：若that引导的主语从句直接位于句首， 则that不能省略；
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主语从句和表语从句知识点1.名词性从句引导词的选择选择原则“缺什么，补什么，什么不缺，用that”“什么不缺，用that”的意思是：如果从句中不缺任何成分，而且句意完整时，就用that来引导主语从句或表语从句以及其他的名词性从句。
2.whether 意为“是否”，引导的主语从句放在句首，不能用if 代替；但当用it 作形式主语时，whether引导的主语从句放在句中或句末，此时可换用if. It is doubtful whether there’ll be any seats left.说不上是否还有座位了。
3.that 引导主语从句时，只起连接作用，不作任何成分，没有实际意义。
在句首时不可省略。
What引导主语从句时既要起连接作用，又要在从句中作主语或宾语，在任何情况下都不能省略，它具有具体意义，表示“什么，所……的（事、物、话）”，相当于all that/ everything that. Which引导主语从句也作成分，它表示选择的意义，常译为“那个”。
如：That he survived in the earthquake is a miracle. 他在地震中幸免于难，这是个奇迹。
4.关系代词what, which, who引导主语、表语从句时含有疑问意义，而whatever,whichever, whoever在引导名词性从句时，往往比what, which, who更强调，不表示疑问意义。
而且whatever=all that/everything that; whichever=anything that;whoever=anyone who.另外，whatever=no matter what时引导状语从句。
如：Whatever is worth doing at all is worth doing well.凡是值得做的事情都值得好好地做。
I语法填空。
使用正确连接词补全下列句子。
1.They lost their way in the forest and ______made matters worse was ______ nightbegan to fall.2.______ drives after drinking should be punished.3.It is said ______ Peter will have a chance to travel abroad next month.4.______ we fear when traveling in summer is the sudden change of weather.5.______ we will go camping tomorrow is up to you.6.I read about it in some book or other, does it matter ______ it was?7.______ of you comes in will be given a prize.8.______ he didn’t come yesterday is unknown.9.______we will go tomorrow hasn’t been decided yet.10.______ will be asked to accomplish the task is still discussed.II. 测试题1. ---I’ll ask the teacher about the attributive clause. I’m very puzzled about it.---That’s just ______most of our classmates have doubt.A.whatB. whyC. whereD. how2. His father got him a job in a bank but soon it became clear ______ he was not fit for that kind of work.A. whyB. whatC. whetherD. that3. It even leaves the scientists in wonder ______ they should call the newly-born creature, which looks half-human and half-animal.A. thatB. whyC. whatD. how4. The brave national spirits showed in the film The Flowers of war are ______deeply moved the audience.A. whichB. thatC. whatD. who5. ______ is surprising is that there are so many Chinese restaurants in Toronto.A. ItB. ThatC. SuchD. What6. ---Are you still thinking about yesterday’s party?---Oh, that’s______.A.what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited7. Faced with challenges, you should believe your courage is ______ makes a difference.A. howB. thatC. whichD. what8. ______ is obviously right is to give all children equal opportunities to develop their special gift.A. ItB. AsC. ThatD. What9. The reson for Tom’s failure in the exam was ______ he didn’t work hard.A. whyB. becauseC. whetherD. that10. ______ is known to us all is that the old worker, for ______ life was hard in the past, still works hard in his seventies.A. As; whomB. What; whoseC. It; whoseD. What; whom11. What is concerning us greatly is ______ the workers held up in that area yesterday will be set free.A. thatB. whatC. whenD. which12. What the doctors really doubt is ______my mother will recover from the serious disease soon.A. whenB. ifC. whetherD. what13. The beautiful view and friendly people are ______ newcomers like the city.A. whenB. whatC. whereD. why14. ______ is known to us all is that the Chinese government has spared no efforts to protect people from fake food.A. AsB. ItC. ThatD. What15. At the evening party the host said ______ was able to solve the riddle could get a nice present as a reward.A. whoeverB. whoC. no matter whoD. whomeverIII. 根据汉语提示完成句子1.他想要做什么还不知道。
______ he ______ ______ ______ ______still unknown.2.不知道明天他是否会参加那个舞会______ ______ ______ ______ he will take part in the ball ______ ______ tomorrow.3.问题是我们如何帮助灾区人民重建家园The problem ______ ______ ______ ______ people in disaster areas rebuild their hometown.4.他的希望是她能很快减肥。
Her wish ______ ______ ______ ______ ______ ______ soon.5.很遗憾你没来参加展会。
______ ______ ______ ______ ______ you didn’t come to the party.IV. 改错题。
每句有一处错误，找出并改正。
1.Energy is that makes thing work.2.Go and get your bag. It’s there you left it.3.This is true that Lin Dan won a gold medal in Longon Olympic Games.4.What moved us most was what he looked after the old man for more than twentyyears.5.He was late again made his teacher angry.6.Your biggest fault is you think too much of yourself.7.My doubt is if he will go out with us.8.That’s something I ought to do.9.Professor Zhou will come is certain.10.That is needed for the space trip is careful preparation.11.That is because the brothers wanted to make a bet.12.It remains to be seen that we’ll succeed.13.The problem was whom could do the work.14.Who wins the first prize will be able to go abroad for further education.II. 单项选择1.What impresses me most is ______ he appears in front of others; he wears asincere and charming smile.A.whichB. thatC. whereD. that whenever2.______ I saw was two women quarreling in the street.A.WhatB. WhomC. WhoD. That3.______ she couldn’t understand was ______ her son didn’t want t tell her thetruth.A.What; whyB. That; whatC. What; becauseD. That; because4.---I had a bad headache and a high fever.---Is that ______ you had a few days off?A.whatB. whenC. whyD. where5.The reason ______many international students choose to study in the US was______ American colleges and universities offer a better education than those intheir local areas.A.that; becauseB. why; thatC. that; becauseD. why; because6.You are saying that everyone should be equal and this is ______ I disagree.A.whyB. whereC. whatD. how7.______ was unimportant.A.Whether he enjoyed our dinner or notB.No matter how enjoyed our dinnerC.If he enjoyed our dinnerD.What he enjoyed our dinner8.It is reported by the United Nations ______ the world’s population has reachedthe 7 billion mark.A.asB. whichC. thatD. whether9.______ was not the way the event happened.A. Which the press reportedB. That the press reportedC. What did the press reportD. What the press reported10. ______ team wins on Saturday will go through to the national championships.A. No matter whatB. No matter whichC. WhateverD. WhicheverIIII.1.______want to tell you is the deep love and respect I have for my parents.A.ThatB. WhichC. WhetherD. What2.From space, the earth looks blue. This is ______ about seventy-one percent of itssurface is covered by water.A.whyB. howC. becauseD. whether3.If the government fails to take effective measures, it is probable ______ Siberiantigers could disappear from China within 10 to 20 years.A.whyB. howC. whenD. that4.______ Jackie Chan shows to his fans is excellent martial arts and attractivepersonality.A.WhichB. WhatC. ThatD. Whom5.---Hi, Jane. You seem to be thinner than I saw you last time.--- Well, I’m preparing for my final examination. That’s ______I got thin.A.whenB. howC. whatD. whether6.---He likes to try something other people have never tried before.---Yes. That’s ______he is different from others.A.whereB. whenC. howD. what7.______she was invited to the ball made her very happy.A.IfB. WhenC. ThatD. Because8.It is none of your business ______ other people think about you. Believeyourself.A.howB. whatC. whichD. when9.As is known to us, knowledge is ______ can change your life.A.thatB. whatC. whichD. how10.______she teaches these children to speak English well receives attention of theparents.A.whatB. whichC. whereD. how11.One advantages of playing the guitar is ______ it can give you a great deal ofpleasure.A.howB. whyC. thatD. when12.As you expected, the problem troubling me at present is ______ my parentsdon’t allow me to travel to the United States alone.A.thatB. whetherC. howD. what13.The place ______ bridge is supposed to be built should be ______ the cross-rivertraffic is the heaviest.A.which; whereB. at which; whichC. at which; whereD. which; in which14.---I rang you at about nine, but there was no reply.---That was probably ______ I was seeing the doctor.A.whyB. whatC. thatD. when15.I can borrow him the book, but it is uncertain ______ he will give it back ontime.A. sinceB. whatC. whenD. whether。