求一些用主语从句写的句子
主语从句的时态：不受主句的时态影响和限制。
（1）That he finished writing the composition in such a short time surprised us all. （2）Whether we will go for an outing tomorrow remains unknown. （3）Who will be our monitor hasn't been decided yet. （4） Whom we must study for is a question of great importance. （5）What caused the accident remains unknown. （6）Whatever you did is right. （7）Whose watch was lost is unknown. （8）What we need is time. （9）What we need are good doctors.为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末 （1）It is certain that he will win the match. （2）It is true that he has made a very important discovery in chemistry. （3）It is very likely that they will hold a meeting. （4）It is strange that he should do that. （5）It is important that we all should attend the meeting. （6）It is strange that the man should have stuck to his silly ideas. （7）It is a pity that we won't be able to go to the south to spend our summer vacation. （8）It is still a mystery what caused the accident. （9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai) （10）It is known to all that the gun powder was first invented by the Chinese. （11）It is suggested that the work should be done with great care. （12）It seems that he has seen the film.(=He seems to have seen the film) （13）It happened that the two cheats were there. (=The two cheats happened to be there)
求主语从句例句，越简单越好。
一、主语从句定在句子中担当主语的个从句，这个从句就叫做主语从句二、主语从句例句：1. What surprised me most was that the little girl could play the violin so well. 2. Who will go to the concert is not known. 3. That she was chosen made us very happy. 4. Whether she will come or not is still a question. 5. Which book they will choose is still unknown. 6. When we shall hold our sports meet is not decided. 7. It’s strange that he knows nothing about it. 8. It is a pity that she has made such a mistake. 9. It is said that President Jingo will visit our school next week.三、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。
四、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
五、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)
求主语从句例句，越简单越好。
主语从句顾名思义，它必然是相当于主语成分的，而且不是单个的名词充当，必须是从句。
如：what he did was very important to us all.前面的what he did 就是主语从句。
希望能帮到你，望采纳
it 做形式主语时、句子是主语从句么
形式主语是动词不定式的一种,它也是逻辑主语, 可以把它归类到逻辑主语的第一种(不定式的逻辑主语) 用作宾语的不定式，用作目的状语，用作结果状语的不定式都是属于不定式的大概念里面的。
形式主语it 作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替 的是句子的逻辑主语，概括起来会有如下情况： 句子的逻辑主语为不定式 如：It is very kind of you to give me a hand in time. It is my pleasure to address the meeting. It was pretty hard for him to bring up the child on his own. 句子的逻辑主语为从句 如：It so happened that the tickets were sold out. It is extremely obvious that she has been lying about her identity. It suddenly occurred to me that the message must have been hidden between the layers of the briefcase. 句子的逻辑主语为动名词短语 这类句子远不如前面两种出现率高，主要在（no good, waste, useless, no use, dangerous）等词语的后面用 如：It is no use reasoning with him. It is no good reading in dim light. 作形式主语的代词只能用it ，不能用that，this等词。
例如: 1) It is easier to lose friends than to make friends. 交朋友难而失去朋友比较容易。
2) It is important for modern young people to master at least two foreign languages. 掌握至少两门外语对于当代年轻人来说是很重要的。
以上两句中的it是形式主语，真正的主语是后面的不定式短语。
3) It is considered no good reciting without understanding. 不理解的背诵被认为是没有好处的。
4) It is no use crying over spilt milk. 覆水难收。
以上两句中的it是形式主语，真正的主语是V-ing形式。
5) It is a fact that English is being accepted as an international language.英语作为一门国际语言正日益为人们所接受，这是不争的事实。
(NMET,95) 6) It depends on the weather whether we will go. 我们去不去得看天气行事。
(其中的whether 不能换成if,因为if不能引导主语从句。
) 以上两句中真正的主语是名词性从句。
it 作形式主语主要用于下列三种情况不定式作真正主语 主要用于下列句型： 1. It + is\\\/was + adj.\\\/n. (形容词或名词) +to do sth. A. 名词作表语。
主要有a pity, a pleasure, an idea等。
例如： In fact________is a hard job for the police to keep order in an important football match. ( 2001上海高考题) A. this B. that C. there D. it (答案为D) 再如： It is a great pleasure to do this. 这样做多好啊。
It is a good idea to think this way. 这样考虑问题是个好办法。
除be外，其他动词也有跟名词的情况。
例如： It seems a pity to waste the food. 浪费这些食物真可惜。
It requires efforts to master a foreign language. 掌握一门外语需要种种努力。
B. 形容词或形容词短语作表语。
分两种情况： 1) 下列形容词： kind, good, nice, clever, wrong, right ,foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。
形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。
例如： It was foolish of you to leave school.你中途退学，真是傻瓜。
It was brave of her to speak out in public. 她能当众大声讲话，真勇敢。
这种of sb. to do sth. 句型，of 的宾语可以作句子的主语。
上面两个句子可以改写为： You were foolish to leave school. She was brave to speak out in public. 2) 其他形容词作表语，常见的形容词有：necessary, hard， important, difficult, easy, possible，common等。
例如： It is necessary to use a short-wave radio to pick up the programmes. 必须用短波收音机才能收到节目。
如果要说明不定式表示的动作是谁做的，可以在不定式前加for + 名词或代词 + to do sth.(for 后的宾语不能作句子的主语)。
名词或代词作不定式的逻辑主语，即表示不定式所指动作的执行者。
在此句型中，形容词只对不定式行为者作某种描述，而不涉及其品行。
例如： It is not hard for one to do a bit of good. 对于一个人来说做点好事并不难。
It,s common for leaves to fall from the trees in the fall. 秋天树叶从树上落下是件常事。
需要注意的是：动词不定式作主语，一般情况下用it作形式主语，而把动词不定式(从句)放在后面。
也可以直接用不定式作主语。
例如： It is wrong to tell lies. = To tell lies is wrong. 撒谎是不对的。
但在疑问句和感叹句中，只能用it作形式主语。
例如： Isn't it a good idea to have a walk around? 出去兜一圈难道不是一个好主意吗
What a pleasure it is to work with you! 同你一起工作是多么愉快啊
2. It + v. + to do sth. 动词不定式作主语时除动词be以外，动词take, cost， need, require, make, sound, occur 等也可用it作形式主语，而把动词不定式放在后面。
例如： It took us three years to complete the project. 我们花费三年时间才完成了这项工程。
It sounds reasonable to do it this way.听起来这样做有道理。
It needed hard work to finish the job. 要完成这项工作需要努力地工作。
It didn,t occur to me to ask him to help me. 我根本没想到要找他帮忙。
动名词作真正主语 用于这种形式的是一些特定的形容词和名词。
例如： It was nice meeting you. 见到你真高兴! (分别时用) 它与不定式作真正主语的区别在于，动名词说到的动作已经发生。
例如: It is nice to meet you. (刚刚见面时用) it 作形式主语，动名词作真正主语主要用于下列句型： It's +n.(名词或名词短语)\\\/adj.(形容词)+ doing sth. 1)下列形容词后常用动名词作真正主语：nice, good, useless, hard, foolish, enjoyable, worthwhile等。
例如： It is nice talking to you. 跟你交谈真是愉快。
It's foolish behaving like that. 这样的表现是很愚蠢的。
It is useless doing that. 那样做没用。
2)下列名词或名词短语作表语时常用动名词作真正主语：use, good, fun, a waste of, job, task等。
例如： It's a waste of time doing this. 这样做是浪费时间的。
It's no good (use) doing that. 那样做没好处(没用)。
It's an awful job doing this. 做这事真是一件可怕的差事。
It's fun doing this. 做这事真有趣。
It is not an easy task doing this work. 做这工作真非易事。
名词从句作真正主语 用it 作形式主语的结构主要用于下列句型： It +谓语+名词从句(主语从句、表语从句、同位语从句) 1. It is +名词+从句: 这样的名词有a fact, a surprise, an honor(非常荣幸),a pity, common knowledge(常识)等。
例如： It is common knowledge that the full moon brings fair weather. 皓月兆天晴,这是常识。
It is a surprise that you gave such an answer to the question. 你对这个问题作了这样的回答，令人吃惊。
2. It is +形容词+从句 : 这样的形容词有natural, true, strange, necessary, important, obvious(很明显), certain, wonderful, funny, possible, likely, probable等。
例如： It is certain that free medical care will be given to most people in our city. 我们城市的多数人将享受免费医疗，这是一定的。
It is probable that he has known everything. 很可能他什么都已经知道了。
3. It +动词+从句: 这样的动词有seem,happen, appear, look, matter, make, strike, occur(突然想起)等。
It appeared that he had a taste for music. 看来他对音乐有一定的鉴赏力。
It made us very happy that she was saved.她能化险为夷令我们大家很高兴。
4. It + be + 分词+从句: 这样的分词有 said(据说)， reported(据报道),believed(人们相信)，known(众所周知)，decided(已决定)，proved(已证实), thought, expected, annouced, arranged, amusing, puzzling, striking等。
例如： It is said that Li Hao has been to Europe.据说李郝去过欧洲。
It was amusing that a rabbit ran out of the empty box on the desk.桌上的空盒子里竟然跑出来一只兔子,太有趣了。
需要说明的是，大部分连接词引导的主语从句都可以用 it充当形式主语。
例如： It remains unknown when they are going to get married. 他们何时结婚依然不明。
It says in the newspaper that the enemy has been defeated. 报纸上报导敌人被打败了。
形式主语： It +be+(the)+adj.+for sb.+to do sth.
