主语从句用法详解
主语从句用法详解 Company number：【WTUT-WT88Y-W8BBGB-BWYTT-19998】
主语从句用法详解(例句丰富)
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
That he is still alive is a wonder. 他还活着，真是奇迹。
That we shall be late is certain. 我们要晚了，这是确定无疑的。
That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。
That she is still alive is a consolation. 她还活着是使人感到宽慰的。
That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。
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。
That she was chosen made a tremendous stir in her village. 她被挑选上，在她村
子里引起很大轰动。
2. whether引导
Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
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
Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。
Whichever you want is yours. 你要哪个哪个就是你的。
4. 连接副词引导
When we arrive doesn’t matter. 什么时候到没有关系。
How it was done was a mystery. 这是怎样做的是一个谜。
How this happended is not clear to anyone. 这件事怎样发生的，谁也不清楚。
How many people we are to invite is still a question. 邀请多少人还是一个问题。
Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。
5. 关系代词型what引导
What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
What’s done is done. 事已成定局。
What he says is not important. 他说的话并不重要。
What I am telling you is mere impressions. 我和你说的都不过是一些印象而已。
What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。
What you need is a good-sized canvas bag. 你需要的是一个比较大的帆布袋。
What I am afraid of is their taking him to Portugal. 我担心的是他们把他带到葡萄牙去。
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：
It’s a pity that he didn’t come. 很遗憾他没来。
It is important that he should know about this. 他必须知道此事。
It’s vital that we be present. 我们出席是至关重要的。
It was intended that you be the candidate. 大家的意图是让你当候选人。
It is important that this mission not fail. 这项使命不失败至关重要。
It is essential that a meeting be convened this week. 本周开一次会非常重要。
It is appropriate that this tax be abolished. 废除这个税是恰当的。
It’s unfair that so many people should lose their jobs. 竟有这么多人失业这是不公平的。
It’s amazing that she should have said nothing about it. 她竟未谈及此事令人惊讶。
It’s unthinkable that they should deny my request. 他们竟然拒绝我的请求，这是不可思议的。
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：
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
It was a problem whether they would support us. 他们是否会支持我们还是一个问题。
It remains to be seen whether it will do us harm or good. 它对我们是利是害，还得看看再说。
(3)对关系代词型what引导的主语从句，通常直接将主语从句放在句首。如：
What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
有时也可将助用形式主语。如：
It is clear enough what he meant. 他是什么意思很清楚。
(4)如果句子是疑问句，则必须用带形式主语it的结构：
Is it true that he is the girl’s father 他是那女孩的父亲，是真的吗
How is it that you are late again 你怎么又迟到了
三、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；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that可以省略：
That you didn’t go to the talk was a pity. 很遗憾你没去听报告。(that不可省)
It was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。(that可省)
名词性从句之主语从句讲解
名词性从句---主语从句 1. What is needed for the space trip is careful preparation. 2. Her wish is that she can lose weight soon. 3. I think that woman can reach every high achievements in many fields of science. 4. We were very excited at the news that our team had won. 引导名词性从句的关联词可分为三类： 一．从属连词：that（无任何词意） whether, if（均表示“是否”表明从句内容的不确定性） as if ,as though（均表示“好像”，“似乎”）以上在从句中均不充当任何成分二．连接代词：what, who, whom, which，whose, whatever, whoever, whichever(作主宾表定) 三．连接副词：when, where, how, why(作状语) I.主语从句 1.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。 2.位置：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。 3.引导主语从句的关联词： (1)从属连词that,whether,if (在从句中不充当成分，仅起连接作用) That Jack won the match yesterday surprised us. Whether he’ll come here isn’t clear. (此处不能用if) (2)连接代词who, whom, whose, what, which, whoever, whatever, whichever(充当主宾表定) What she did is not known. Whoever comes is welcome. (3)连接副词where,when,how,why(在从句中充当状语) How this happened is not clear to anyone. When the meeting will be held is decided by our manager. 4.有时为了避免头重脚轻，常用it作形式主语，而把真正主语放在句子末尾。 How the book will sell depends on its author. = It depends on its author how the book will sell. That he is the best student in the class is obvious. = It is obvious that he is the best student in the class. 用it作形式主语的几种常见结构： (1) It is ＋名词＋从句 It is a fact that … 事实是… It is an honor that …非常荣幸 It is common knowledge that …是常识 (2) It is ＋形容词＋从句 It is natural that… 很自然It is strange that… 奇怪的是… (3) It is ＋不及物动词＋从句 It seems that… 似乎… It happened that… 碰巧… It ap pears that… 似乎… (4) It ＋过去分词＋从句
高考英语主语从句讲解
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主语从句和强调句造句
主语从句造句： 1.How well the prediction will be validated by later performance depends upon the amount and reliability of the information used. 这些预测以后将在多大程度上被之后的表现证实，取决于所采用信息的数量和可靠性。 2.It is often important that you make it clear what your particular role is at a given time. 你要搞清楚在指定时期内你的特定角色是什么，这很重要。 3.It is reported that the unemployment rate is very high in many developed countries because financial crisis. 据报道，由于金融危机，很多发达国家的失业率都很高。 4.That mental health is important to physical condition is a fact. 精神健康对身体状况很重要，这是一个事实。 5.That he finished writing the composition in such a short time surprised us all. 他在这么短的时间内完成了写作使我们所有人都惊讶。 6.Whether we will go for an outing tomorrow remains unknown. 我们明天是否会去远足有待商榷。 7.What make the river more beautiful are the plants growing in the water. 为河水增色的是水里的荷花。 8.What struck me was that they have all suffered a lot. 给我印象深刻的是他们都受过很多苦。 9.Whether we will hold a party in the open air tomorrow depends on the weather. 我们明天是否在户外开晚会要看天气而定。 10.Which car you will choose to buy makes no difference. 你决定买哪一辆车都不会有任何区别。 11.It is common knowledge that honesty is the best policy. 诚实是最好的政策是共识。 12.What they need most is not financial aid or loan but advanced technologies and talents in certain key areas.
主语从句详解及练习-附答案
语法要点剖析 一、名词性从句 主语从句、表语从句、宾语从句、同位语从句，在整个句子中所起的作用，相当于一个名词。因此，这四种从句通称为名词性从句。 引导名词性从句的连接词可分为三类： 连接词：that, whether, if （不充当从句的任何成分） 连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, why 1. 主语从句 作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if 和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。that在句中无词义，只起连接作用；连接代词和连接副 词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。例如： What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。 It is known to us how he became a writer. 我们都知道他是如何成为一名 作家的。 Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。 有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下： （1）It + be + 名词+ that从句（2）It + be + 形容词+ that从句 （3）It + be + 动词的过去分词+ that从句（4）It + 不及物动词+ that 从句 另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有： It is necessary (important, natural, strange, etc.) that … It is a pity (a shame, no wonder, etc.) that… It is suggested (requested, proposed, desired, etc.) that… 2. 宾语从句 名词句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。 1. 由连接词that引导的宾语从句 由连接词that引导宾语从句时，that在句中不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时,第二个分句前的that不可省。例如：He has told me that he will go to Shanghai tomorrow.他已经告诉我他明天要去 上海。 We must never think (that) we are good in everything while others are good in nothing. 我们决不能认为自己什么都好，别人什么都不好。
高中英语主语从句知识点整理
高中英语主语从句知识点整理 课 件www.5y https://www.360docs.net/doc/9a8867641.html, 1.定义：用作主语的从句叫做主语从句。 2.构成：关联词+简单句 3.引导主语从句的关联词有三类： 从属连词that。 例如：Thattheywereintruthsisterswasclearfromthefacialrese mblancebetweenthem.很明显，她们确是亲姐妹，她们的脸型很相似。 从属连词whether。 例如：whetherhe'llcomehereisn'tclear.他是否会来这里还不清楚。 连接代词： who whom whose what which whoever whatever
whichever 连接副词： where when how why 例如： whatshedidisnotyetknown.她干了什么尚不清楚。 Howthishappenedisnotcleartoanyone.这事怎样发生的，谁也不清楚。 whoevercomesiswelcome.不论谁来都欢迎。 whereveryouareismyhome----myonlyhome.你所在的任何地方就是我的家----我唯一的家。 注：主语从句能用it作形式上的主语。常以it作形式主语的句型有： A. It+be+形容词+that从句。 例如： Itiscertainthatshewilldowellinherexam.毫无疑问她考试成绩会很好。 Itisprobablethathetoldhereverything.很可能他把一切都告诉她了。
B. It+be+名词词组+that从句。 例如： It'sapitythatwecan'tgo.很遗憾我们不能去。 It'snosurprisethatourteamshouldhavewonthegame.我们没赢这场比赛真意外。 c.It+be+过去分词+that从句。 例如： Itissaidthatmr.GreenhasarrivedinBeijing.据说格林先生已经到了北京。 Itisreportedthatchinahassentanotherman-madeearthsat elliteintoorbit.据报道中国又成功地发射了一颗人造地球卫星。 D.It+seem,happen等不及物动词及短语+that从句。 例如： ItseemsthatAliceisnotcomingtothepartyatall.Alice似乎不来参加晚会。 IthappenedthatIwasoutthatday.碰巧我那天外出了。 E.It+doesn'tmatter+连接代词或连接副词引起的主语从句。
高中英语主语从句教案
要考试，找戴氏戴氏教育乐山分校主讲教师：徐海燕 主语从句——突破高考 1、名词性从句的概念：名词性从句相当于名词。 主语从句 2、名词性从句种类表语从句 宾语从句 3、引导名词性从句的关系词：①从属连词：that；whether；if；as if（表语从句） ②连接代词：who；whom；whose；what；which ③连接副词：when；where；why；how 以及how组成 的短语：how many；how long；how far。。。 （1）主语从句 Eg：A、What surprised me most was to see some of the village people seated on the benches at the end of room. B、That he will come is certain. C、Whether she’s coming or not doesn’t matter too much. D、Which team will win the match is a matter of public concern. E、Where she has gone is not known yet’ ※主语从句较长时，放句末，用it 作形式主语。 Eg：It was well known that Napoleon always asked the same three questions，and usually in the same order. It is uncertain whether he can come or not. It remains a secret how they climbed up the mountain. It has not been decided when they will leave for New York. 总结：用it作形式主语有以下几种常用句型： ①it + be + 形容词+从句 ②it + be + 名词词组+从句 ③it + be + 过去分词+从句 ④it + seems ; happen ;等不及物动词+从句 直击高考： 1、______leaves the room last ought to turn off the light. A、Anyone B、The person C、Whoever D、Who 2、______the Olympic Games will be held in Beijing is not known yet. A、Whenever B、If C、Whether D、That 3、_____he said at the meeting astonished every present. A、What B、That C、The fact D、That 4、_____we can’t get seems better than ______ we have. A、What ; what B、What ;that C、That ; that D、That ;that 5、_____ troubles me is ______ I can’t learn all these English idioms by heart. A、That ; that B、What ; that C、That ; what D、What ;\ 6、______fashion differs from country to country may reflect the cultural differences from one aspect. A、What B、That C、This D、Which
高中英语语法主语从句讲解及练习
名词性从句之主语从句 一、名词性从句概述：在句子中起名词作用的各种从句统称为名词性从句。 根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。 二、主语从句定义： 在句中起主语作用的从句称为主语从句。 引导主语从句的连接词主要有：单纯连词（that, whether/ if）、连接代词(what, whatever, who, whoever, whom, whose, which, whichever等)和连接副词(when, where, why, how, whenever, wherever, however等)。 1)that引导的主语从句 （1）由连词that引导的主语从句:引导词that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 don’t 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; certain; 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.
高考英语专项复习主语从句详解
主语从句详解 一、概述 在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用, 这类从句又可分为主语从句、同位语从句、表语从句和宾语从句. 二、主语从句主要有四类 （1）由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省. 例如：That you will win the medal seems unlikely. That you are so indifferent bothers me. That she survived the accident is a miracle. （2）用连词 whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省. 注意：引导主语从句, 不能用if, 只能用whether. 例如：Whether we will hold a party in the open air tomorrow depends on the weather. Whether she is coming or not doesn’t matter too much. （3）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的功用
高中英语主语从句 知识点讲解
主语从句 在从句中充当主语的复合句，主语即为主句动作的发出者或状态的持有者。有两种形式：直接放句首；it 为形式主语，真正的主语在句子后（为了避免头重脚轻）。主语从句时态不受主句的限制。 （一）连接词引导的主语从句 主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等. 连接词引导的从句 That light travels in straight line is known to all.我们都知道光是以直线传播的。 Whether he will join us is still a question.他是否会加入我们仍是个问题。 连接代词引导的从句 Who will be sent there has not been decided.大家还没有决定谁会被送过来。（主语） What you need is more practice. 你需要更多的练习。(宾语) Whatever we do is to serve the people.我们无论做什么都是为了服务人民。（宾语） Which is the best is not clear.我们不清楚哪个最好。(主语) 连接副词引导的从句 Where he has gone is a question.我们不知道他去哪儿了。（地点状） How he can earn a living in London remains a big problem. 如何在伦敦谋生仍是个大问题。（方式状） When we shall have our sports meet is a mystery. 什么时候会开运动会仍是个迷。（时间状） 注意：在主语从句中，为了避免头重脚轻的问题，常用it为形式主语，真正的主语在句子后。（上述的例子转换） （二）总结it为形式主语的结构： 1)It is + adj. / n. +从句 It is a pity/shame that...遗憾的是…… It is possible that...很可能……
高中主语从句讲解及其练习
主语从句 一、主语从句的连词分三类 （1）从属连词引导的主语从句（that whether if） that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。That 引导主语从句通常用it 作形式主语。 例如：That you will win the medal seems unlikely. That she survived the accident is a miracle. whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省。 注意：引导主语从句，不能用if不能在开头，只能用whether。 Whether we will hold a party in the open air tomorrow depends on the weather. Whether she is coming or not doesn’t matter too much. （2）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. Whatever we do is to serve the people. 注：whatever / whoever的功用 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。 如：Whoever breaks the law should be punished. （主语从句） （＝Anyone who breaks the law should be punished. ） Whoever breaks the law, he should be punished. （让步状语从句） （＝No matter who breaks the law, he should be punished. ） （3）用连接副词when, where, why, how引导的名词性从句(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 hasn’t been made pubic.
主语从句详解及练习_附答案
高二年级语法要点剖析（李翌洋） 一、名词性从句 主语从句、表语从句、宾语从句、同位语从句，在整个句子中所起的作用，相当于一个名词。因此，这四种从句通称为名词性从句。 引导名词性从句的连接词可分为三类： 连接词：that, whether, if （不充当从句的任何成分） 连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, why 1. 主语从句 作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if 和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。that在句中无词义，只起连接作用；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。 例如： （1）What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。 It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。 Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。 注意：有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下： （1）It + be + 名词+ that从句 （2）It + be + 形容词+ that从句 （3）It + be + 动词的过去分词+ that从句 （4）It + 不及物动词+ that 从句 另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有： It is necessary (important, natural, strange, etc.) that … It is a pity (a shame, no wonder, etc.) that… It is suggested (requested, proposed, desired, etc.) that…
主语从句详细讲解及综合练习
主语从句 一、概念：在复合句中起主语作用得从句叫主语从句。 （一）连接词 从属连词：that、whether； 关系代词：who, what, which , whom, whose, whatever, whoever, whomever, whichever； 关系副词：when, where, how, why, however, whenever, wherever等； 例：What he said is true、 That you don’t like him is none of my business、 Whether the football game will be played depends on the weather、 主语从句得时态：不受主句得时态影响与限制。 （1）______ he finished writing the composition in such a short time ______(惊讶) us all、（2）______we will go for an outing tomorrow ______（remains，remained）unknown、（3）______ will be our monitor ______(be) decided yet、 （4）______we must study for ______ (be) a question of great importance、 （5）______ caused the accident ______（remains，remained）unknown、 （6）______ you did ______ (be)right、 （7）______ watch ______(be) lost is unknown、 （8）______we need ______(be) time、 （9）______ we need ______(be) good doctors、 小结: （1)主语从句得时态：不受主句得时态影响与限制。 （2)连词位于句首不能省略（3)主语从句大多数情况下视为三单,但也有例外,如例9 1、从属连词that，whether引导得主语从句。 从属连词that，whether在主语从句中得作用只就是引导主语从句，在从句中不担任成分，不能省略。 例：__________ they will go is certain、 __________ she will come or not is still a question、 __________ she's coming or not doesn't matter too much、 2、it作形式主语引导主语从句。 如果主语从句太长，为避免句子结构头重脚轻，我们可用it作形式主语，而把主语从句放在主句谓语部分之后。That引导得主语从句可用it代替，that 不可省略。 用作it作形式主语得结构： （1）It is/was +形容词+that 从句 It’s natural that…很自然……It’s obvious that …显而易见…… It’s fortunate that …幸运得就是It’s (im)possible…（不）可能…… It’s unlikely that…不可能It’s strange that…奇怪得就是…… （2）It is/was +名词+that 从句 It’s a pity that…遗憾得就是……It’s a fact that …事实就是…… It’s good news that…就是好消息……It’s a wonder that…不足为奇…… It’s an honour that…非常荣幸……It’s a shame that…真就是可耻…… It’s common knowledge that …就是常识… （3）It +不及物动词+that 从句 It seems that…似乎……It happened that…碰巧…… It appears that…瞧来……It turns out that…结果…… （4）It is/was +过去分词+that 从句 It’s not known that………不得而知It’s said that…据说……
主语从句的用法 主语从句讲解
主语从句的用法主语从句讲解 一个句子在复合句中充当一个主语，那么这个句子就是主语从句。下面小编就给大家介绍主语从句的用法。 主语从句的用法 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。 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。 1. It 作形式主语和it引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。例如： It is a pity that you didn’t go to see the film. It is +名词+从句 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; surprise等。 例如：It is a mystery to me how it all happened. 这一切是怎么发生的是个谜。 It is common knowledge that the whale is not a fish. 鲸鱼不是鱼，这是常识。 It is no surprise that Bob should have won the game. 鲍勃会赢得这场比赛，这不足为奇。 It is +形容词+从句 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; certain; evident; worth-while; surprising; interesting; astonishing, etc. 例如：It is obvious that conductors and insulators are both important in industry.
英语中主语从句的相关用法
一、主语从句的概念与类型 主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.例如: That she was chosen made us very happy.她当选了使我们很高兴. What caused the accident is a complete mystery.是什么导致了这次事故还完全是一个谜. Whether she will come or not is still a question.她是否来还是一个问题. Which team will win the match is still unknown.哪个队会赢得这场比赛还不知道. Whoever comes to the party will receive a present.参加聚会的每一个人都将收到一份礼物. When they will start has not been decided yet.他们何时出发还没决定. 注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免"头重脚轻",常用it作形式主语,而把从句放在后面.例如: It is a pity that she has made such a mistake.她犯了这样一个错误,真是遗憾. It depends on the climate whether they are going shopping today.他们是否今天去购物还得看天气情况. 这样就构成了下面一些常用句型: 1)It is + adj. / n. +从句 It is a pity/shame that...遗憾的是…… It is possible that...很可能…… It is unlikely that...不可能…… 2)It +不及物动词+从句 It seems/appears that...似乎…… It happened that...碰巧……
高中英语知识讲解 主语从句
主语从句 概念引入 That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的。 Whether she is ing or not doesn’t matter too much. 她来不来都无关紧要。 What I want to know is this. 我想知道的就是这事。 When the plane is to take off has not been announced . 飞机何时起飞还没有宣布。 观察上面四个句子可以看出，黑体词部分都有连接词连接，后面都是一个谓语动词，黑体词部分都是整个句子论述的主体部分，它们就是我们本单元要学习的主语从句。 语法讲解 什么是主语从句？ 【高清课堂：367100名词性从句（一）主语从句】 在复合句中由一个句子作主句的主语的从句叫主语从句。 What matters is not winning but participating. I don’t know why he is always finding fault with me. My hometown is no longer what it used to be ten years ago. He expressed his hope that he would e to Chengdu again. 其中划横线的部分就是名词性从句。 主语从句引导词： 1. 由what等代词引导的从句,表示“所……的(东西)”，实际上等于一个先行词加上一个定语从句，也可以由-ever等代词引导。 比如: What they are talking about is nothing valuable. What I really want is to have a good rest. Whatever she did is wrong. 比较：Whatever she did, she is wrong. Whoever passes the exam can get 50 yuan. 比较：Whoever passes the exam, I will give him 50 yuan. 比较：Who passes the exam is still not clear. 2. 由that引导的主语从句,通常用形式主语it来代替。 That he has disappeared worries his parents. It worries his parents that he has disappeared. It is not likely that he can win the lottery. It is a big surprise that he is still alive. 3. 由连接代词、连接副词或whether引导的从句。 When she will be back is still a question. Where they had put the files troubled the spy. Whether he will take part in the play is unclear. Whether or not he will go to Japan is up to her. 主语从句的连接词----详述