❶ 高考英语作文怎么样写简单的从句
比如提建议，用非限定性定语从句说明这项措施的好处（用于扩展，即使要点没有也专可以写）
We should take action by saving water and electricity , which is of great value to protect our environment
我们应该采属取行动节约用水或电，这样有利于保护环境、
这种句子很好用，而且后面从句用的方法不必太复杂，只要将到措施都可以套。
状语从句
很经常用，再加个小亮点，主从主语一致时省略
When (we are) crossing the road, we should be careful.
If (you are) tired, you can listen to music or go for a walk to have a rest.
主语从句
What I think is of great importance is that +句子
我认为很重要的是……
后面跟措施，建议，后面句子随便套
恩，我喜欢用的就这些了~~~如果也是高三的咱们一起加油咯！
❷ 高中英语：关于 名词性从句
记住那几个词比看语法有效的多，比如It is necessary (important, natural, strange, etc.) that … It is suggested (requested, proposed, desired, etc.) that…
同位语从句说明其版前面的名词的具权体内容。同位语从句通常由that引导，可用于同位语从句的名词有advice、demand、doubt、fact、hope、idea、information、message、news、order、problem、promise、question、request、suggestion、truth、wish、word等。
如果想知道具体的可以告知我你的邮箱，到时我发到你邮箱去。
❸ 求 高中英语名词性从句的区别及注意事项
名词性从句一.概念：在从句中起名词作用的从句即名词性从句。它们是：主语从句，宾语从句，同位语从句和表语从句。二.引起名词性从句的连词：1.that 无意义，只起倒引起从句的作用，如引导宾语从句可省略。That he beat his opponent in the tennis game encouraged his teammates.He said (that) another child was infected with bird flu.The fact is that he knows nothing about it.应用于Her dream that she will become a woman astronaut is sure to come true. 2.what 有意义，”所……的”或随句子意思而定。在从句中作主语，宾语和表语。 What makes her different from others is her strange behaviour. This is what I want to say. Please tell me what it is. 3.whether 有意义，“是否”，引导宾语从句可以用if。 Whether it is true is not certain. He asked me whether/if he could ask another question. 4.when 引起表示时间的名词性从句，意思是“……的时候”或“何时……” When we can get rid of the rubbish is still unknown. They didn’t know when they could meet again. The question is when the money can be collected. 5.where 引起表示地点的名词性从句，意思是“在……的地方”或“到……的地方” Where the meeting will be held hasn’t been decided. Everyong wants to know where the plant can be found. 6.how 引起表示方式的名词性从句，意思是“……的方式”或“如何……” The problem is how we can get out of the trouble. How we can get in touch with him is the most important. 7.why 引起表示原因的名词性从句，意思是“……的原因”或 “为什么……” Why he said that rubbish at the meeting puzzled me. At last,he told us why he didn’t agree with us. 8.who “谁” ,whom“谁”，whose“谁的” Who will be chosen is the topic of conversation now. I want to know who/whom you really want to see. Whose handwriting is the most beautiful is very clear now. 9.疑问词+ever 也可以引起名词性从句 Whatever was said here must be kept secret. Whoever fails to see this will make a big mistake. I’ll give it to whoever likes it. Parents shouldn’t give their children whatever he/she wants.三. 名词性从句的种类：四种——主语从句，宾语从句，同位语从句和表语从句1. 主语从句：在复合句中充当主语的从句叫主语从句，上述引导词除if外均可引起主语从句。 Who has been chosen is still a secret to all. That one believes in oneself in doing everything is very important.注意：主语从句如果偏长，可将其移至谓语动词之后，前面用it作形式主语。That he is an honest boy is known to all.→It is known to all that he is an honest boy.That the Chinese volleyball team once won six world championships successively is true.→It is true that the Chinese volleyball team once won six world championships. 在It is insisted/ordered/commanded/suggested/advised/proposed/demanded/required/requested…that…结构中，谓语动词常用should+动词原形。如：It is suggested that we should think twice before we act. It is requested that we should change the old instrument. 另外，在It is necessary/important/strange/surprised that…或 It is a pity/shamethat… 也用 should + 动词原形 如：It is a pity that he should go without telling anyone. It is necessary that you should tell him the truth. 2. 宾语从句：在复合句中作宾语的从句叫宾语从句，以上连词都可引起宾语从句。 Everyone knows that he always gives answers and never ask questions,so he is called Mr Know-all.宾语从句应注意的几个问题：① 当一个动词带有两个或两个以上that 引导的宾语从句时，第一个that 可以省略，但从第二个开始不可以省略。 He said (that) he would spend his winter holiday in London this year and that it would be the first time he would spend his holiday alone abroad.② 当宾语从句有补语时，要用形式宾语it代替，而将宾语从句移至补语后，同时that不可省略。 We should make it clear that protecting the environment is everyone’s ty.We find it important that one forms a good habit.③ 在tell sb. that…; order sb.that…; remind sb.that…; explain to sb. that…; whisper to sb. that…等结构中that 不可省。 He told me that he was going abroad next month. He whispered to me that the man in blue is a policeman.④ 在be+adj.后的宾语从句中，that 可以省略。 I’m glad (that) I’ll see all my fiends soon. I’m sure (that) he will stand on our side.⑤ whether和if 均能引起宾语从句，但是if 只能在动词后，在介词后要用whether。 He asked whether/if we could do him a favour. We wondered whether/if he would come or not.---Will you come tomorrow?---Sorry,I really don’t know. It depends on whether it is raining (or not).⑥ 宾语从句在时态上要求与主句一致（即时态呼应），也就是说主句为一般现在时，从句可用任何时态；如从句为一般过去时态，主句应为过去时的某种时态。当然，从句为普遍真理和自然现象者例外. He says that he lives around the corner. He says that he has been here for a long time. He says that he once worked as a cook. He says that he is expecting his father’s telephone. He said that he was learning English for the 2008 Beijing Olympic Games. He said that he would go abroad for further information. He said that it does not snow in winter in Australia.⑦ 在某些动词后的宾语从句中用虚拟语气，其结构为should+动词原形，should 可以省略。这些常用动词是：一个坚决要求insist; 两个命令order,command; 三个建议suggest,advise,propose；四个要求ask,demand,request,require 注意：insist有两个意思“坚决要求”和“坚持认为”，前者用虚拟语气，而后者用陈述语气（实际时态）；同样suggest 也有两个意思“建议”和“表明”或“暗示”，当“建议”讲时用虚拟语气，否则用陈述语气（实际时态）。 如：He insisted that he should go to the front.(虚拟语气) He insisted that Tom was honest and hardworking.(陈述语气) She suggested that she should answer the phone immediately.(虚拟语气) The smile on her face suggested that he was satisfied with the result.(陈述语气)上述其他动词后一律用should+动词原形如 They requested that an immediate answer should be given. He ordered that the troops (should) start at once.3.同位语从句：idea,fact,rumour,message,news,hope,belief,thought,doubt,proof,evid-ence，promise,probability等名词后出现的that 或wh-引导的从句作同位语，人们称之为同位语从句，同为语从句对所修饰得词起解释说明的作用。I had no idea that you were here.They expressed the hope that they would visit China again.There is no doubt that he is not fit for the job.The question how they could get the information was brought forward at the meeting .The government warned that the rumour that an earthquake would hit Harbin was not believable.在下列同位语从句中，谓语动词用should+动词原形：One’s suggestion /advice/order/requirement/request/that… 如：My suggestion that we should collect money for the poor girl has been taken.4.表语从句：由that, as if, wh-等引起的作表语的从句叫做表语从句。 The manager’s suggestion is that the new procts should be put in market as soon as possible. The fact remains that we are behind some developed countries. It seems /appears as if the problem has been settled. That’s what we should do. Asia is no longer what it used to be. That’s where we differ. That was how we were defeated. That was when our football team was formed. That was why we decided to put off the discussion. 在下列表语从句中，谓语动词用should+动词原形： One’s suggestion/requirement/order… is that… 如：My suggestion is that we should give him another chance. Her requirement is that she should be sent to Tibet to work.四. 解题要点： ①如果从句意思完整，须用that,因为that 不作成分。 ②在涉及到“是否……”时用whether,if只用在动词后的宾语从句中，而且也可以换成whether. ③that和what不可混淆，that无意义，不作成份；what有意义，做成分 ④that的不可省。
❹ 高中英语名词性从句总结 谢谢
名词性从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。一、引导名词性从句的连接词分类 引导名词性从句的连接词可分为三类： 连词（5个）：that （宾语从句或表语从句中that有时可以省略） 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 连接代词（9个）：what, whatever, who, whoever, whom, whomever, whose, which, whichever 连接副词（7个）：when, where, how, why, whenever, wherever, however 不可省略的连词： 1. 介词后的连词 2. 引导主语从句和同位语从句的连词不可省略。 That she was chosen made us very happy. We heard the news that our team had won. 比较 whether与if 均为"是否"的意思。 但在下列情况下，只可用whether： 1. whether引导主语从句并在句首 2. 引导表语从句 3. whether从句作介词宾语 4. 常与 "or not" 连用；if 则不可。 5. 引导同位语从句 Whether he will come is not clear. 大部分连接词引导的主语从句都可以置于句末，用 it充当形式主语。 It is not important who will go. It is still unknown which team will win the match. 二. 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，as if和because等连接代词what，who，which，whatever，whoever，whom等以及连接副词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。because引导表语从句。注：whom、who指人，what指物，whatever，whoever表示泛指意义。例如： What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。 Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。 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 suggested (requested, proposed, desired, etc.) that… 三、宾语从句 名词从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。 注意：在demand、order、suggest、decide、insist, desire, request, command, doubt等表示要求、命令、建议、决定等意义的动词后，宾语从句常用“（should）+ 动词原形”。例如： I insist that she (should) do her work alone. 我坚持要她自己工作。 The commander ordered that troops (should) set off at once. 司令员命令部队马上出发。 2. 用who，whom, which, whose, what, when, where, why, how, whoever, whatever, whichever等关联词引导的宾语从句相当于特殊疑问句，应注意句子语序要用陈述语序。例如： I want to know what he has told you. 我想知道他告诉了你什么。 She always thinks of how she can work well. 她总是在想怎样能把工作做好。 She will give whoever needs help a warm support. 凡需要帮助的人，她都会给予热情的支持。 3. 用whether或if引导的宾语从句，其主语和谓语的顺序也不能颠倒，仍保持陈述句语序。此外，whether与if 在作“是否”的意思讲时在下列情况下一般只能用whether，不用if： a. 引导主语从句并在句首时；b. 引导表语从句时；c . 引导从句作介词宾语时；d. 从句后有“or not”时；e. 后接动词不定式时。例如： Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。 Everything depends on whether we have enough money. 一切要看我们是否有足够的钱。 I wonder whether he will come or not. 我想知道他来还是不来。 Can you tell me whether to go or to stay? 你能否告诉我是去还是留？ 4. 注意宾语从句中的时态呼应，当主句动词是现在时，从句根据自身的句子情况，而使用 不同时态。例如： I know (that) he studies English every day. （从句用一般现在时） I know (that) he studied English last term. （从句用一般过去时） I know (that) he will study English next year. （从句用一般将来时） I know (that) he has studied English since 1998. （从句用现在完成时） 当主句动词是过去时态（could, would除外），从句则要用相应的过去时态，如一般过去时，过去进行时，过去将来时等；当从句表示的是客观真理，科学原理，自然现象，则从句仍用现在时态。例如： The teacher told us that Tom had left us for America． 5. think, believe, imagine, suppose等等动词引起的否定性宾语从句中，要把上述主句中的动词变为否定式。即将从句中的否定形式移到主句中。例如： We don’t think you are here. 我们认为你不在这。 I don’t believe he will do so. 我相信他不会这样做。 四、表语从句 在复合句中，位于系动词之后作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大致一样，表语从句位于连系动词后，有时用as if引导。其基本结构为：主语 + 系动词 + that从句。例如： The fact is that we have lost the game. 事实是我们已经输了这场比赛。 That’s just what I want. 这正是我想要的。 This is where our problem lies. 这就是我们的问题所在。 That is why he didn’t come to the meeting. 那就是他为什么不到会的原因。 It looks as if it is going to rain. 看上去天要下雨了。 需要注意的，当主语是reason时，表语从句要用that引导而不是because。例如： The reason why he was late was that he missed the train by one minute this morning . 【注意】whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句。 五、同位语从句 同位语从句说明其前面的名词的具体内容。同位语从句通常由that引导，可用于同位语从句的名词有advice、demand、doubt、fact、hope、idea、information、message、news、order、problem、promise、question、request、suggestion、truth、wish、word等。例如： The news that we won the game is exciting. 我们赢得这场比赛的消息令人激动。 I have no idea when he will come back home. 我不知道他什么时候回来。 The thought came to him that Mary had probably fallen ill. 他想到可能玛丽生病了。 同位语从句和定语从句的区别： that作为关系代词，可以引导定语从句，充当句子成分，在从句中作宾语时可以省略； that引导同位语从句时，起连词的作用，没有实际意义，不充当句子成分，一般不能省略。 试比较下面两个例句: I had no idea that you were here．（that引导同位语从句，不能省略） Have you got the idea（that）this book gives you of life in ancient Greece？（that引导定语从句，作宾语，可以省略） 六、名词性that-从句 （1）由从属连词that引导的从句叫做名词性that-从句。That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。名词性that-从句在句中能充当主 语、宾语、表语、同位语和形容词宾语，例如： 主语：That she is still alive is her luck. 她还活着全靠运气。 宾语：John said that he was leaving for London on Wednesday. 约翰说他星期三要到伦敦去。 表语：The fact is that he has not been seen recently. 事实是近来谁也没有见过他。 同位语：The fact that he has not been seen recently disturbs everyone in his office. 近来谁也没有见过他，这一事实令办公室所有的人不安。 形容词宾语：I am glad that you are satisfied with your job. 你对工作满意我感到很高兴。 2）That-从句作主语通常用it作先行词，而将that-从句置于句末，例如： It is quite clear that the whole project is doomed to failure. 很清楚，整个计划注定要失败。 It's a pity that you should have to leave. 你非走不可真是件憾事。 用it作形式主语的that-从句有以下四种不同的搭配关系： a. It + be +形容词+ that-从句 It is necessary that… 有必要…… It is important that… 重要的是…… It is obvious that… 很明显…… b. It + be + -ed 分词+ that-从句 It is believed that… 人们相信…… It is known to all that… 众所周知…… It has been decided that… 已决定…… c. It + be +名词+ that-从句 It is common knowledge that… ……是常识 It is a surprise that… 令人惊奇的是…… It is a fact that… 事实是…… d. It +不及物动词+ that-从句 It appears that… 似乎…… It happens that… 碰巧…… It occurred to me that… 我突然想起…… 七、名词性wh-从句 1）由wh-词引导的名词从句叫做名词性wh-从句。Wh-词包括who, whom,. whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词。Wh-从句的语法功能除了和that-从句一样外，还可充当介词宾语、宾语补语和间接宾语等，例如： 主语： How the book will sell depends on its author. 书销售如何取决于作者本人。 直接宾语：In one's own home one can do what one likes. 在自己家里可以随心所欲。 间接宾语：The club will give whoever wins a prize. 俱乐部将给得胜者设奖。 表语： My question is who will take over president of the Foundation. 我的问题是谁将接任该基金会主席职位。 宾语补足语：She will name him whatever she wants to. 她高兴给他起什么名字就取什么名字。 同位语： I have no idea when he will return. 我不知道他什么时候回来。 形容词宾语：I'm not sure why she refused their invitation. 我尚不能肯定她为什么拒绝他们的邀请。 介词宾语： That depends on where we shall go. 那取决于我们去哪儿。 2）Wh-从句作主语也常用先行词it做形式主语，而将wh-从句置于句末，例如： It is not yet decided who will do that job. 还没决定谁做这项工作。 It remains unknown when they are going to get married. 他们何时结婚依然不明。 八、if, whether引导的名词从句 1）yes-no型疑问从句 从属连词if, whether引导的名词从句是由一般疑问句或选择疑问转化而来的，因此也分别被称为yes-no型疑问句从句和选择型疑问从句，其功能和wh-从句的功能相同， 例如： 主语：Whether the plan is feasible remains to be proved. 这一计划是否可行还有待证实。 宾语：Let us know whether / if you can finish the article before Friday. 请让我们知道你是否能在星期五以前把文章写完。 表语：The point is whether we should lend him the money. 问题在于我们是否应该借钱给他。 同位语：They are investigating the question whether the man is trustworthy. 他们调查他是否值得信赖。 形容词宾语： She's doubtful whether we shall be able to come. 她怀疑我们是否能够前来。 介词宾语： I worry about whether he can pass through the crisis of his illness. 我担心他是否能度过疾病的危险期。 2）选择性疑问从句 选择性疑问从句由关联词if/whether…or或whether…or not构成，例如： Please tell me whether / if they are Swedish or Danish. 请告诉我他们是瑞典人还是丹麦人。 I don't care whether you like the plan or not.我不在乎你是否喜欢该计划。 if和whether的区别： 1、 在动词不定式之前只能用whether 。如： 例8 I can’t decide whether to stay. 我不能决定是否留下。 2、 在whether …… or not 的固定搭配中。如： 例9 I want to know whether it’s good news or not . 我想知道是否是好消息。 3 、在介词后，只能用whether。如： 例10 His father is worried about whether he lose his work . 他的父亲担心是否会失去工作。 4、宾语从句放在句首表示强调时，只能用whether 。如： Whether this is true or not, I really don’t know. 这是否真的，我真的不知道。 （例11 Whether they can finish the work on time is still a problem . 他们是否能准时完成这项工作还是个问题。－－此例为主语从句，有误，感谢指出） 5、用if会引起歧义时，只用whether。如： 例12 Could you tell me if you know the answer ? 这句话有两种意思：“你能告诉我是否知道答案吗？”或“如果你知道答案，请告诉我，好吗？”。如用whether可避免歧义. 九、否定转移 1) 将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。 I don't think I know you. 我想我并不认识你。 I don' t believe he will come. 我相信他不回来。 注意：若谓语动词为hope,宾语从句中的否定词不能转移。 I hope you weren't ill. 我想你没有生病吧。 2) 将seem, appear 等后的从句的否定转移到前面。 It doesn't seem that they know where to go. 看来他们不知道往哪去。 It doesn't appear that we'll have a sunny day tomorrow. 看来我们明天不会碰上好天气。 3) 有时将动名词，介词短语或整个从句的否定转变为对谓语动词的否定。 I don't remember having ever seen such a man. 我记得从未见过这样一个人。 (not否定动名词短语 having…) It's not a place where anyone would expect to see strange characters on the street. 在这里，人们不会想到在街上会碰上陌生的人。 (anyone 作主语，从句中的谓语动词不能用否定形式。) 4) 有时状语或状语从句中否定可以转移到谓语动词前。 The ant is not gathering this for itself alone. (否定状语) 蚂蚁不只是为自己采食。 He was not ready to believe something just because Aristotle said so. (否定because状语) 他并不因亚里斯多德说过如何如何，就轻信此事。 She had not been married many weeks when that man's younger brother saw her and was struck by her beauty. (否定状语many weeks) 她结婚还不到几个星期，这个人的弟弟就看见她了，并对她的美貌着了迷。
❺ 高中英语语法 的名词性从句
名词性从句
名词性从句就是在句子中充当名词功能的以相关从属连词引导的从句，包括主语从句、宾语从句、表语从句和同位语从句四种。
1．主语从句：以连词 that what whom whose what which whoever whatever whichever where when how why 引导，在句子中充当主语。
例：What she said is not yet known.
How this happened is not clear to anyone.
Whoever comes is welcome.
That she will do well is her exam is certain.（It is certain that she will do well in her exam.）
注：it 为形式主语，
2．宾语从句：以连词 that who whom whose what 等引导，在句子中充当宾语。
例：He told us that he felt ill.
Everybody knows what happened.
I doubt whether he will succeed.
I wonder what he is writing about.
3．表语从句：以 that whether who whom whoever when where when 等引导，在句子中充当表语。
例：The trouble is that I lost his address.
The question is whether they will be able to help us.
That was what she did this morning.
This is why we puts off the sports meeting.
4．同位语从句：同位语从句有自己的先行词，它跟定语从句很相似，先行词包含从句中所含内容，从句不起修饰作用。我们将在学习定语从句时，在加以详细比较，多用在连词what 引导。（不用which，此外还可用whether who where 等也可以引导。在这章中我们着重学习that whether 引导的同位语从句，引导同位语从句的先行词常用的有：fact news idea whether reply promise truth report remark 等。
例：I heard the news that the Chinese football team defeated the Japanese team
last night.
I have no idea whether he will come or not.
They were all much worried over the fact that you were sick.
关于名词性从句的学习主要是我们应在学习中加以练习，在练习中反复学习，在多次重复学习和练习中加以掌握。
❻ 高中英语定语从句，名词性从句区别，名词性从句用法。要详细。
定语从句在主句中充当定语，起修饰作用，相当于一个虚词，即去掉它句子仍版然完整。
而名词性从句权，从句在主句中充当名名词的作用，也就是相当于一个实词，当去掉它的时候，主句也就不完整了。
以上是区分定语从句和名词性从句。
http://ke..com/view/414544.htm
名词性从句
❼ 高中英语，，定从和名词性从句什么区别，求归纳
首先搞抄清名词和定语的袭区别。
名词在句中的成分，有主语，宾语，表语，同位语，是一个名词性的存在。
定语是形容名词用的成分,是形容词性的存在。
名词从句就是一个句子当名词。名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
定语从句就是一个句子做定语，这个句子去修饰一个名词。
❽ 求对英语名词性从句的详细总结，高考用
名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句，其功同名词一样。
一．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 doesn’t interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
2. 用it 作形式主语的结构
(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…
(4) it ＋过去分词＋从句
It is reported that… 据报道…
It has been proved that… 已证实…
3. 主语从句不可位于句首的五种情况
(1) if 引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如：
It is said that President Jingo will visit our school next week. (right)
That President Jiang will visit our school next week is said. (wrong)
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如：
It occurred to him that he failed in the examination. (right)
That he failed in the examination occurred to him. (wrong)
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not. (right)
Whether he is wrong or not doesn’t matter. (wrong)
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening? (right)
Is that will rain in the evening likely? (wrong)
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
1) What you said yesterday is right.
2) That she is still alive is a consolation.
二．宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词之后。
1. 作动词的宾语
(1) 由that引导的宾语从句（that 通常可以省略）,例如：
I heard that be joined the army.
(2) 由what, whether (if) 引导的宾语从句，例如：
1) She did not know what had happened.
2) I wonder whether you can change this note for me.
(3) 动词＋间接宾语＋宾语从句。例如：
She told me that she would accept my invitation.
2. 作介词的宾语
例如：Our success depends upon how well we can cooperate with one another.
3. 作形容词的宾语
例如：I am afraid (that) I’ve made a mistake.
That 引导的从句常跟在下列形容词后作宾语：
Anxious, aware, certain, confident, convinced, determined, glad, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied, content 等。也可以将此类词后的that 从句的看作原因状语从句。
4. It 可以作为形式宾语
It 不仅可以作为形式主语，还可以作为形式宾语而真正的宾语that 从句则放在句尾，特别是在带复合宾语的句子中。 例如：
We heard it that she would get married next month..
5. 后边不能直接跟that 从句的动词
这类动词有Allow, refuse, let, like, cause, force, admire, condemn, celebrate, dislike, love, help, take, forgive等。这类词后可以用不定式或动名词作宾语，但不可以用that引导的宾语从句。例如：
I admire their winning the match. (right)
I admire that they won the match. (wrong)
6. 不可用that从句作直接宾语的动词
有些动词不可用于“动词＋间接宾语＋that从句“结构中，常见的有Envy, order, accuse, refuse, impress, forgive, blame, denounce, advise, congratulate等。例如：
He impressed the manager as an honest man. (right)
He impressed the manager that he was an honest man. (wrong)
7. 否定的转移
若主句谓语动词为Think, consider, wuppose, believe, expect, fancy, guess, imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。例如：
I don’t think this dress fits you well.（我认为这件衣服不适合你穿。）
三．表语从句
表语从句在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的that常可省略。另外，常用的还有the reason is that… 和It is because 等结构。例如：
1) The question is whether we can make good preparation in such a short time.
2) This is why we can’t get the support of the people
3) But the fact remains that we are behind the other classes.
4) The reason he is late for school is that he missed the early bus.
四．同位语从句
同位语从句就是在复合句中作名词的同位语的名词性从句。
1. 同位语从句的功能
同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，例如：
1) The king’s decision that the prisoner would be set free surprised all the people.
2) The order that all the soldiers should stay still is given by the general.
2. 同位语在句子中的位置
同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。例如：
He got the news from Mary that the sports meeting was put off.
3. 同位语从句与定语从句的区别
(1) 定语从句中的that既代替先行词，同时以在从句中作某个成分（主语或宾语），而同位语从句中的that是连词，只起连接主句与从句的作用，不充当句中任何成分。
(2) 定语从句是形容词性的，其功能是修饰先行词，对先行词加以限定，描述定的性质或特征；同位语从句是名词性的，其功能是对名词进行补充说明。例如：
1) The news that he told me is that Tom would go abroad next year.（他告诉我的消息是汤姆明年将出国。）（第一个that引导的从句是定语从句，that在从句中作宾语）
2)The news that Tom would go abroad is told by him.（汤姆将出国的消息是他讲的。）（同位语从句，that在句中不作任何成分）
http://www.iselong.com/English/0001/1382.htm
这里也有
http://www.lme.com.cn/Article/FREE_YY/YFBD/200485144806.asp
http://www.yscbook.com/Article/jiaoxi/200605/1291.html