三大从句语法讲解
三大从句知识点
三大从句知识点三大从句是英语语法中的重要知识点，包括名词性从句、形容词性从句和副词性从句。
下面将分别介绍这三种从句的定义、用法和例句。
一、名词性从句名词性从句是在句子中充当名词的成分，可以作主语、宾语、表语或同位语。
名词性从句分为主语从句、宾语从句、表语从句和同位语从句。
1. 主语从句：在句子中充当主语的从句，常用连接词有that、whether、if等。
例句：That she is not coming is a great disappointment to us.（她不来对我们来说是个很大的失望。
）2. 宾语从句：在句子中充当宾语的从句，常用连接词有that、whether、if等。
例句：I don't know whether he will come or not.（我不知道他是否会来。
）3. 表语从句：在句子中充当表语的从句，常用连接词有that、whether、if等。
例句：The important thing is that we finish the project on time.（重要的是我们要按时完成这个项目。
）4. 同位语从句：用来解释或说明名词或代词的从句，常用连接词有that、whether、if等。
例句：The fact that he lied surprised everyone.（他撒谎的事实让每个人都感到惊讶。
）二、形容词性从句形容词性从句是用来修饰名词或代词的从句，常用连接词有who、whom、whose、which、that等。
5. 限制性形容词性从句：对名词或代词进行限制或修饰，不能省略。
例句：The book that I borrowed from the library is very interesting.（我从图书馆借来的那本书非常有趣。
）6. 非限制性形容词性从句：对名词或代词进行补充说明，用逗号与主句隔开，可以省略。
例句：My sister, who is a doctor, lives in London.（我的妹妹是个医生，住在伦敦。
(完整)高中英语主要要掌握三大从句
高中英语主要要掌握三大从句。
分别是：1、定语从句（形容词从句）2、名词词从句（包括主语从句，宾语从句，表语从句，同位语从句）3、状语从句（副词性从句，包括时间，地点，结果，目的，原因等）一、定语从句：定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词组或代词即先行词。
定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
1、关系代词引导的定语从句关系代词所代替的先行词是人或物的名词或代词，并在从句中充当主语、宾语、定语等成分。
关系代词在定语从句中作主词保持一致。
（1）, who, whom, that这些词代替指人，“whom”作宾语指人，“that”既可作主语又可作宾语（作宾语可以省略），可以指人也可以指物。
（2），Which 用来指人或物(用作主语、宾语，作宾语时可以省略）（3），whose“whose”表示谁（可以为人也可以为物）的（东西）2、关系代词引导的定语从句（1），关系副词why主要用于修饰表示原因的名词（主要是the reason），同时它在定语从句中用作原因状语。
（2），关系副词when主要用于修饰表示时间的名词，同时它在定语从句中用作时间状语。
（3），关系副词where主要用于修饰表示地点的名词，同时它在定语从句中用作地点状语。
3、非限制性定语从句它起补充说明作用，缺少也不会影响全句的理解。
在非限制性定语从句的前面往往有逗号隔开。
二、名词性从句在句子中起名词作用的句子叫名词性从句(Noun Clauses）。
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。
引导名词性从句的连接词可分为三类：1、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2、连接代词（9个）：what, whatever, who, whoever, whom, whomever, whose, which, whichever3、连接副词（7个）：when, where, how, why, whenever, wherever, however三、状语从句状语从句（Adverbial Clause）状语从句指句子用作状语时，起副词作用的句子。
英语三大从句语法讲解
英语三大从句在英语中,主要有三大从句,即名词性从句包括主语从句,宾语从句,表语从句,同位语从句、形容词性从句即定语从句、副词性从句即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等;定语从句一、关系代词引导的定语从句关系代词代替前面的先行词,并且在定语从句中充当句子成分,可以作主语、宾语、定语等;常见的关系代词有：who, that, which;它们的主格、宾格和所有格如下表所示：一关系代词who, whom和 whose的用法who代替人,是主格,在定语从句中作主语;An architect is a person who designs buildings. 建筑师是设计房屋的人;whom代替人,是宾格,在定语从句作宾语,在非正式英语常可省略;Do you know the gentleman whom we met in the school library yesterday 昨天我们在学校图书馆里遇到的那位先生你认识吗whose一般代替人,有时亦可代替物,是所有格,在定语从句作定语; The girl student whose father is a senior engineer used to study abroad. 其父是一位高级工程师的那个女学生过去在国外留学;Do you know the name of the hotel whose window we can see here 我们这儿能看到窗户的那个宾馆叫什么名字,你知道吗关系代词whose指代先行词hotel,正式用法应该用of which;whose window=the window of which,意思是：the window of the hotel; 二关系代词which的用法which代替物,在定语从句作主语或宾语,作宾语时还可省略;I do not like stories which have unhappy endings.我不喜欢有不幸结局的小说;which可以换成that三关系代词that的用法that既可指人又可指物,在当代英语中大多指物,在定语从句作主语或宾语,作宾语时还可省略;：Is she the girl that sells newspapers她是卖报纸的那个女孩吗that可以换成whoWhere is the ice-cream that was in the fridge放在冰箱的冰激凌哪儿去了that可以换成whichIs this the book that you want to buy这是你要买的那本书吗 that可以换成which,在定语从句作宾语,还可以省略二、关系副词引导的定语从句常用的关系副词只有三个：when, where, why,在定语从句中充当时间、地点和原因状语;一关系副词when的用法关系副词when代替的先行词表示的是时间,when在定语从句作时间状语;In Beijing July and August are the months when it rains very often.北京的七月和八月是常下雨的月份;when先行词是months二关系副词where的用法关系副词where代替的先行词表示的是地点,where在定语从句作地点状语;During the Spring Festival I went back to the town where I was brought up.春节期间,我回到了生我养我的家乡;where的先行词是town三关系副词why的用法关系副词why代替的先行词表示的是原因,why在定语从句作原因状语;The reason why I am phoning you is to ask you whether you have got my email.我打电话给你的原因是想问问你是否收到了我的电子邮件;why先行词是reason, 当代英语里why可以用that替代,这时关系代词that 就变成了表示原因的关系副词,还可以将why省略三、特殊关系代词as引导的定语从句一在固定搭配as…as, so…as, such…as, the same…as中,as引导定语从句You may take as many books as you want.你想要拿多少书就拿多少;第一个as是副词,修饰many的；第二个as才是关系代词,代替先行词books,在定语从句中作宾语二独立于主句之外,as引导定语从句As we know/ As is known to us, the earth turns around the sun. 正如我们所知,地球围绕太阳旋转;As we know和 As is known to us均为定语从句,as分别作宾语和主语,替代后面的主句;Taiwan is, as you know, an inseparable part of China.你知道,台湾是中国不可分割的一部分;关系代词as指代整个主句,在定语从句中作宾语;四、关系代词who, which与that的区别一关系代词who与that的区别1. 当关系代词用作主语时,多用主格who;He who loses hope loses all.失去希望的人就失去一切;先行词为代词he, they, any, all, one 等时,多用whoI met Alice, who told me that she was learning Chinese.我遇见艾丽斯,她告诉我她在学汉语;在非限制性定语从句中,用who 2. 当关系代词用作介词后的宾语时,用宾格whom,不用that;The man to whom our headmaster talked just now is our English teacher.我们校长刚才与他谈话的那个人是我们的英语老师;介词与关系代词紧密相连时,只能用宾格whom,不可用主格who注意：介词与关系代词不是紧密相连时,或者说介词放在句子后面时,这时可以用主格who,也可用that,还可以省略关系代词;因此,上面的这句话还可以有如下四种说法：1 The man whom our headmaster talked to just now is our English teacher.2 The man who our headmaster talked to just now is our English teacher.3 The man that our headmaster talked to just now is our English teacher.4 The man our headmaster talked to just now is our English teacher.3. 当关系代词泛指人时,多用that;He is a man that is never afraid of failure.他是个从不怕失败的人;that用来泛指人4. 当关系代词出现在who开头的疑问句时,应用that;例如：Who is the girl that is talking to Tom in English用英语同汤姆交谈的那个女孩是谁避免重复使用who,以免造成误解或语义含混不清二关系代词which与that的区别1. 当先行词为all, much, little以及不定代词anything, something, everything等时,关系代词多用that;All that glitters is not gold. 闪闪发光物,未必尽黄金;She told me everything that she knew. 她把她所知道的一切都告诉了我;2. 当先行词的前面有形容词最高级、序数词或限定词the only, the very, all, every, any, no等时,关系代词一般都用that;This is the best novel that I have ever read. 这是我读过的最好的一部小说;He is the only person that has been invited to the ball. 他是惟一应邀参加舞会的人;3. 当关系代词出现在which开头的疑问句时,应用that;Which was the hotel that was recommended to the foreign guest 哪一个是推荐给外宾的宾馆这里使用that很明显是为了避免重复which4. 在非限制性定语从句中,关系代词一般只用which;Beijing, which is the capital of the People’s Republic of China, will host the 2008 Olympic Games. 北京是中华人民共和国的首都,将主办2008年奥运会;5. 介词后的关系代词用which,而不用that;She has collected 600 stamps, 60% of which are German stamps. 她收集了600张邮票,其中60％是德国邮票;五、定语从句的位置如前所述,定语从句一般总是直接置于所修饰的名词或代词之后;有时候,定语从句与先行词之间插入了其他的短语,这样它们被分隔了,这种情况下的定语从句被称作隔离定语从句;There was a girl upstairs who was shouting and crying, obviously mad.楼上有一个女孩,大喊大叫;很明显,她疯了;定语从句who was shouting and crying修饰the girl,被upstairs所隔开A new master will come tomorrow who will teach you German. 明天要来一位新老师教你们德语了;定语从句置于句末以示强调名词性从句宾语从句一、引导词1由that 引导的陈述句性的宾语从句,在很多动词如say, think, wish , hope, see, believe, agree, expect, hear , feel等动词后;连词that只起连接作用,在从句中不做句子的成分,也无词汇意义,在口语中常被省略;如：I told him that he was wrong.在think, believe, suppose, expect等动词引起的宾语从句中,有时谓语尽管是否定意义,却不用否定形式,而将think 等动词变为否定形式;见语法：否定转移如：I don’t think you are right. 我认为你做的不对在许多带有复合宾语的句子中,that引导的宾语从句经常移到句子的后面,而用it做形式宾语;We think it wrong that he told a lie to everyone 我认为他向每一个人撒谎是错误的2 由连词if、 whether 引导的表示“是否…”的宾语从句; Whether, if 在从句中不做句子的成分,一般情况下,whether和if 可以替换;I don’t know if/whether he will come tomorrow.在介词后面的宾语从句中不用if引导Everything depends on whether we have enough money.宾语从句中有or not时不用if引导.I don’t know whether the movie star will come or not.和不定式连用作宾语时不用if引导Whether to go there or not hasn’t been decided.3由wh-引导的宾语从句;连接代词who, whom, whose, what, which 和连接副词when, where, why, how 等连接的宾语从句,它们在句中即有连接从句的作用,又在句中充当句子的成分;Do you know which film they are talking about which做定语I don’t know where he lives. where 做地点状语二、宾语从句的语序,宾语从句的语序必须是陈述语序,既连接词+主语+谓语+其他成分 I believe that they will come soon.特例：有下列常见的问句,作为从句出现,是“不改变语句顺序”的;1. What's the matter2. What's wrong3. What's up4. What's the problem5. What's your trouble三、宾语从句的时态;宾语从句的时态受主句的限制,即：主句是一般现在时态,从句根据实际情况而定；主句是一般过去时态,从句用相应的过去的时态;如果从句的动作发生在主句之前,则从句要用过去完成时态;1 She says that she is a student.→ She said that she was a student.2She says that she will fly to Japan in a week. → She said that she would fly to Japan in a week.3She says that she has finished her homewor k already. → She said that she had finished her homework already.1如果宾语从句说的是客观真理、自然现象或事实时,这时宾语从句要用一般现在时态;The teacher said that the earth goes round the sun.2Could you tell me…是用来征询对方的意见,语气委婉,并不表示过去;Could you tell me when we will visit the History Museum注意事项：3由陈述句变成宾语从句时,要注意人称的变化;She said: “I have been to England before.” → She said that she had been to England before.She asked me: “Do you like maths” → She asked me if I liked maths.4宾语从句与简单句的交换;由连接代词和连接副词引导的宾语从句,如果宾语从句的主语和主句的主语是同一个人时,可以用“疑问词+不定式”做宾语的简单句结构;I don’t know what I should do next. → I don’t know what to do next.DO SOME EXERCISES:1.Can you see AA. what he’s readingB. what is he readingC. what does he readD. he reads what2. Does Jack come from Japan Do you know合并成一个句子Do you know ___that__Jack __come___from Japan3._What did your son say in the letter_He told me that he_D__ the Disney the next day.A. will visitB. has visitedC. is going to visitD. would visit4. He didn’t know___A____A. what’s the matterB. what the matter isC. what was the matterD. what the matter was5. Somebody called you just now, but I didn’t know__D__A. who were theyB. who they wereC. who was itD. who it was6. I want to know___D__A. what is his n ameB. what’s his nameC. that his name isD. what his name is7. ---Could you tell me __C__she is looking for---Her cousin, Susan.A. thatB. whose C .who D. which8. ---What are you searching the Internet for---I’m trying to find out____.A. What is the difference between SARS and BIRDFLUB. How many persons have died in IraqC. How to protect our environmentD. Why is our Chinese team be able to beat Korea同位语从句一一般来说,在主从复合句中,用作同位语的从句叫同位语从句;它通常跟在某些名词之后,用以说明或解释该名词表示的具体内容;可以跟同位语从句的名词通常有：advice, decision, fact, hope, idea, information, message, news, promise, proposal, reply, report, suggestion, word消息,problem, question, doubt, thought等; eg: They were delighted at the news that their team had won.当听到他们队获胜的消息时,他们欣喜若狂;有时同位语从句可以不紧跟在被说明的名词后面,而被别的词隔开; 如：The thought came to him that Tom might have returned the book. 他突然想起汤姆可能已经还了书了;二引导词1. The news that Mr. Li will be our new English teacher is true.2. He hasn’t made the decision whether he will go there.3. The question who should do the work is being discussed at the meeting.4. I have no idea what the boy is doing in the next room now.5. We haven’t yet settled the question where we are going to spend our summer vacation this year.6. I have no idea how I can get to the railway station.7. I have no idea when he will be back．小结：① that引导同位语从句时无词义,也不充当任何成分,但通常不可以省略,如句1；② whether引导同位语从句时意为“是否”,通常不能用if来代替, 如句2;③ 连接代词who, what等可以引导同位语从句,如句3, 4；④ 连接副词where, how, when等可以引导同位语从句, 如句5,6,7;三 that 引导的同位语从句和定语从句① 意义不同：同位语从句用来进一步说明前面名词的内容；而定语从句用来修饰、限定前面的先行词;试比较：1. The news that our team has won the final match isencouraging.2. The news that you told us is really encouraging.② that的功能不同：that引导同位语从句时是一个纯连词,不充当任何成分；而引导定语从句时,不仅起连接作用,而且还指代先行词并在从句中充当主语、宾语等成分;试比较：1. Dad made a promise that he would buy me a CD player ifI passed the English test.2. Dad made a promise that excited all his children.③ 可否省略：that在引导同位语从句时,通常不可省略;在引导定语从句时,若在从句中作宾语,通常可以省略,若作主语则不可以省略;DO SOME EXERCISES:I. 请用适当的词填空,使下列句子意思完整;1. They expressed the hope _that_ they would come over toChina soon.2. The fact ___that____ he didn’t see Tom this morning istrue.3. Word has come __where_____ some American guests will cometo our college for a visit next week.4. He can’t answer the question ___how____ he got the moneyfrom his home yesterday.5. Do you have any idea __what___ is actually going on inthe classroom6. The problem _______ we should have the meeting in the hallnow must be decided at once.II. 下列各句中均有一处错误,请改正;1. Our team has won the game, that made us very happy.2. I’ve come with a message from Mr Wang how he won’t beable to see you this afternoon.3. He must answer the question if he agrees with what shesaid or not.4. I’ve read the book where you gave me the day beforeyesterday. 5. One of the men held the opinion when what the book said was right.表语从句表语从句只能置于主句之后,而主句的动词只能是连系动词;名词性从句在be等系动词后作表语时被称为表语从句The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西;how 在表语从句中充当方式状语The scissors are not what I need. 这把剪刀不是我所需要的;what 在表语从句中充当宾语What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本;what在主语从句中作直接宾语, that 作为表语从句的引导词在该表语从句中不充当句子成分, 不能省略That is what I want to tell you.那就是我想要对你讲的;what在表语从句中充当直接宾语That is why she failed to pass the exam. 那就是她考试不及格的原因;why 在表语从句中充当原因状语“That is why...”是常用句型, 意为“这就是……的原因/因此……”, 其中why引导的名词性从句在句中作表语, 该句型通常用于针对前面已经说明过的原因进行总结下面是两个与“That is why...”形式相似的结构, 它们与“That is why...”结构之间的关系要能够辨析清楚：1“That is why...”与“That is the reason why...”同义, 只不过从语法结构上讲, “That is the reason why...”中why引导的是—个定语从句, 将其中的the reason去掉则与“That is why...”结构一样 That is the reason why I cannot agree.2“That is because...”句型中从属连词because引导的名词性从句在此作表语, 这也是个常用句型, 意为“这就是为什么……/因为……”;“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由, “That is why...”则指由于各种原因所造成的后果He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影, 那是因为他得帮助他的妹妹做作业;第一句话说明结果, 第二句话说明原因He had seen the film before. That is why he did not seeit last night.他以前曾看过那部电影, 因此他昨天晚上没有去看;第一句话说明原因, 第二句话说明结果考题1The traditional view is ____ we sleep because our brain is “programmed” to make us do so. 2007上海A. whenB. whyC. whetherD. that考题2You are saying that everyone should be equal, and this is ____ I disagree. 2004A. whyB. whereC. whatD. how考题3— I drove to Zhuhai for the air show last week.— Is that ____ you had a few days off 1999A. whyB. whenC. whatD. where考题4____ made the school proud was ____ more than 90% of the students had been admitted to key universities. 2003上海春A. What; becauseB. What; thatC. That; whatD. That; because考题5—Are you still thinking about yesterday’s game—Oh, that’s ____. 2003北京春A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited 表语从句与宾语从句的关系宾语从句和表语从句都属于名词性从句;其作用跟名词在句中的作用相同;故充当宾语的句子叫宾语从句,充当表语的句子叫表语从句;宾语从句1对于宾语从句要掌握以下三点①语序: 从句的语序必须是陈述句语序, 即“主语 + 谓语”这种形式;②时态: 当主句是一般现在时或一般将来时的时候, 从句可以是任何时态, 而当主句是一般过去时的时候, 从句时态必须是过去时范围的时态, 即一般过去时, 过去进行时, 过去完成时, 过去将来时;③连接词: 当从句意思完整, 主句意思肯定时, 连接词用that, 且可以省去当从句意思完整, 主句意思不确定或含否定含意时, 常用if或whether是否当从句意思不完整时, 连接词则是代替不完整部分的特殊疑问词;表语从句在句子中起表语作用的从句叫做表语从句,位于主句系动词的后面;表语从句的引导词和主语从句的引导词相同;也是名词性从句的一种;What the police want to know is when you entered the room.警察想知道的是你什么时候进的房间;The trouble is that we are short of funds困难是我们缺乏资金; This is what we should do这是我们应当做的;That is why I want you to work there那就是我要你在那儿工作的原因;His first question was whether Mr. Smith had arrived yet他的第一个问题是史密斯先生到了没有; 从句中的疑问句用正常语序,即陈述语序;as if, as though, because也可用来引导表语从句;She seems as if she had done a great thing她看起来好像做了一件大事;It is because you eat too much那是因为你吃得太多了;状语从句一状语从句的种类1.时间状语从句2.地点状语从句；3.原因状语从句；4.条件状语从句；5.目的状语从句；6.让步状语从句；7比较状语从句；8.程度状语从句；9.方式状语从句；10.结果状语从句;二状语从句的时态一般情况下,时间和条件状语从句的谓语动词一般用“一般现在时”表示“一般将来时”,用“现在完成时”表示“将来完成时”;1时间状语从句1.由when, while, as引导的时间状语从句;when, while和as的区别：when引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词;并且when有时表示“就在那时”; While引导的从句的谓语动作必须是延续性的,并强调主句和从句的动作同时发生或者相对应;并且while有时还可以表示对比;While my wife was reading the newspaper, I was watching TV. As表示“一边……一边”,as引导的动作是延续性的动作,一般用于主句和从句动作同时发生；as也可以强调“一先一后;As we was going out, it began to snow.当我们出门时,开始下雪了;as强调句中两个动作紧接着先后发生,而不强调开始下雪的特定时间2.由before和after引导的时间状语从句;before引导的从句不再用否定式的谓语,并且当before引导的从句位于主句之后,有时译成“就,才”; 时态：当主句用将来时,从句总是用现在时；如果before引导的从句谓语用的是过去时,则主句动词多用过去完成时,这样以便体现动作发生的先后;After表示主句动作发生在从句动作之后;主句和从句的动作的时间关系正好与before引导的从句相反;3.由till或until引导的时间状语从句;till和until一般情况下两者可以互换,但是在强调句型中多用until;并且要注意的是：如果主句中的谓语动词是瞬时动词时,必须用否定形式；如果主句中的谓语动词是延续性动词时,用肯定或否定形式都可以,但表达的意思不同;4.由since引导的时间状语从句;since引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词;一般情况下,从句谓语动词用一般过去时,而主句的谓语动词用现在完成时;但在It is ＋时间＋since从句的句型中,主句多用一般现在时;5.由as soon as, immediately, directly, instantly, the moment, the instant, the minute, 等引导的时间状语从句;这些连词都表示“一……就”;hardlyscarcely, rarely…when / before, no sooner…than 相当于as soon as之意;主句用过去完成时,从句用一般过去时;当hardly, scarcely, rarely和no sooner位于句首时,主句应用倒装语序;6.由by the time引导的时间状语从句;时态的变化：在一般情况下,如果从句的谓语动词用一般过去时,主句的谓语动词用过去完成时；如果从句的谓语动词用一般现在时,主句的谓语动词用将来完成时;7.由each time, every time和whenever引导的时间状语从句;8.由as long as和so long as引导的时间状语从句;这两个连词表示“只要；和…一样长”;2地点状语从句地点状语从句一般由连接副词where, wherever等引导,已经形成了固定的句型,：句型1：Where＋地点从句,there＋主句;此句型通常译成“哪里……哪里就……”；主句在从句后面时,there 可用可不用；如果主句在从句的前面时,一般都不用there;句型2：Anywhere/ wherever＋地点从句,＋主句;状语从句是句子的状语由一个从句充当,来修饰主句中的动词,形容词或副词等;状语从句都由从属连词引导,与主句连接,放在句末时,一般不在前面加逗号;3原因状语从句： because, since, as和for都表示原因;because 语势最强,回答why提出的问题,用来说明人所不知的原因;当能够很明显的看出原因或人们已知原因,就用as或since;由because引导的从句如果放在句末,且前面有逗号,则可以用for来代替;但如果不是说明直接原因,而是多种情况加以推断,就只能用for;4目的状语从句：表示目的状语的从句可以由in order that, so that,等词引导;5结果状语从句：结果状语从句常由so...that 或 such...that引导,首先要了解so和such后面分别跟什么词;such是形容词,修饰名词或名词词组,so是副词,只能修饰形容词或副词;so 还可与表示数量的形容词many, few, much, little连用,形成固定搭配;The box is so heavy that I can't carry it.6让步状语从句：是由though, although 引导的状语从句;。
从句的种类和用法详解
从句的种类和用法详解从句是英语语法中重要的一个部分，由一个主句和一个或多个从句组成。
从句可以增加语言的表达力，使句子更加丰富多样。
本文将详细解释从句的种类和用法，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功能，可以作主语、宾语、表语或补语。
常见的名词性从句有三种种类：主语从句、宾语从句和表语从句。
1. 主语从句主语从句在句子中充当主语的角色，常以"that"引导。
例如："That he is late surprises me."（他迟到了让我感到惊讶。
）2. 宾语从句宾语从句在句子中充当动词的宾语，通常由"that"引导，但在口语中可以省略。
例如："I believe that he will come." （我相信他会来。
）"I know he will come." （我知道他会来。
）3. 表语从句表语从句在句子中充当表语的角色。
例如："The important thing is that you try your best."（最重要的是你尽力而为。
）二、定语从句定语从句用来修饰名词或代词，常以关系代词或关系副词引导。
定语从句通常紧跟在被修饰的名词或代词之后。
例如："The man who is speaking is my teacher."（正在说话的那个人是我的老师。
）"The book that I borrowed from the library is interesting."（我从图书馆借的那本书很有趣。
）三、状语从句状语从句用来表达时间、条件、原因、结果、目的、比较等信息，在句子中充当状语的角色。
根据不同的用途，状语从句可以分为六种类型。
1. 时间状语从句时间状语从句用来表示一个动作或事件发生的时间。
英语三大从句语法讲解
英语三大从句在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
定语从句一、关系代词引导的定语从句关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。
常见的关系代词有：who, that, which（一）关系代词who, whom和who代替人，是主格，在定语从句中作主语。
An architect is a person who designs buildings. 建筑师是设计房屋的人。
whom代替人，是宾格，在定语从句作宾语，在非正式英语常可省略。
Do you know the gentleman whom we met in the school library yesterday? 昨天我们在学校图书馆里遇到的那位先生你认识吗？whose一般代替人，有时亦可代替物，是所有格，在定语从句作定语。
The girl student whose father is a senior engineer used to study abroad. 其父是一位高级工程师的那个女学生过去在国外留学。
Do you know the name of the hotel whose window we can see here? 我们这儿能看到窗户的那个宾馆叫什么名字，你知道吗？（关系代词whose指代先行词hotel，正式用法应该用of which。
whose window=the window of which，意思是：the window of the hotel。
）（二）关系代词which的用法which代替物，在定语从句作主语或宾语，作宾语时还可省略。
I do not like stories which have unhappy endings.我不喜欢有不幸结局的小说。
考研英语语法之三大从句
三大从句一、定语从句定语从句，简言之，就是用来做定语的句子，即用于修饰名词或代词的一个具有完整主谓结构的句子。
这个被修饰的名词或代词因为总是在定语从句的前面，所以我们称之为先行词。
而引导定语从句的连词，叫关系词，分为关系代词和关系副词。
One reason why it is hard to design and teach such courses is that they cut across the insistence by top American universities that liberal-arts education and professional education should be kept separate, taught in different schools.（一）定语从句的先行词先行词是定语从句所修饰的对象。
只有正确找出先行词，才能明白定语从句所修饰的究竟是什么成分，才能正确理解句子前后各部分的逻辑关系，分清句子结构，从而正确理解句子。
1. 一个词（通常是名词，也可以是代词）For a social epidemic to occur, however, each person so affected must then influence his or her own acquaintances, who must in turn influence theirs, and so on; and just how many others pay attention to each of these people has little to do with the initial influential.2. 一个短语During the past generation, the American middle-class family that once could count on hard work and fair play to keep itself financially secure has been transformed by economic risk and new realities.3. 一个从句The Greeks assumed that the structure of language had some connection with the process of thought, which took root in Europe long before people realized how diverse language could be.4. 一个完整的句子As can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of this condition.They are invited to the state banquet, which was a great honor to them.（二）引导定语从句的关系词1.It is about YOU, and how you performed and what you accomplished in those past jobs –especially those accomplishments that are most relevant to the work you want to do next.She had recently left a job and had helped herself to copies of the company’s client data, which she intended to draw upon in starting her own business.At the same time, the American Law Institute – a group of judges, lawyers and academics whose recommendations carry substantial weight – issued new guidelines for tort law stating that companies need not warn customers of obvious dangers or bombard them with a lengthy list of possible ones.dream, a window opens into a world where logic is suspended and dead people speak.Now the tide appears to be turning. As personal injury claims continue as before, some courts are beginning to side with defendants, especially in cases where a warning label probably wouldn’t have changed anything.Pearson has pieced together the work of hundreds of researchers around the world to produce a unique millennium technology calendar that gives the latest dates when we can expect hundreds of key breakthroughs and discoveries to take place.（三）定语从句与先行词的隔离考研英语中有很多复杂的定语从句，它们的先行词并不像常规那样紧靠着关系词，而是在先行词与关系词之间插入了很多成分。
英语三大从句
英语三大从句LELE was finally revised on the morning of December 16, 2020复合句【语法要点】复合句是由一个主句加一个或几个从句所构成的句子。
从句只用作句子的一个成分，不能独立。
根据从句在句子中的作用，可分为名词性从句、定语从句和状语从句三类。
（一）名词性从句名词性从句包括主语从句、表语从句、宾语从句、同位语从句。
其关联词有连接词that、if、whether；疑问代词who、what、which和疑问副词when、where、how、why等。
1）if不能引导表语从句。
连接代词who、what、whose、which不能引导同位语从句。
2）有时as、as if/though、because也可以引导表语从句，能跟表语从句的谓语动词一般为系动词be、seem、look等。
例如：Things are not always as they seem to be.事情并不总是像表面上看来的那样。
It looks as if it were going to rain. It is because you eat too much.3）介词宾语不可以用which来引导，而要用what来引导。
例如：We can learn what we did not know. He will talk to us about what he saw in the .4）连词that引导的名词性从句除能用在except、but、in后之外很少作介词的宾语，。
其它一些介词的宾语从句如果由连词that引导，则需用it先行一步作形式宾语。
例如：He is a good student except that he is careless.You may depend on it that they will support you.5）若主句谓语动词是及物动词make、find、think、see、hear等，则把宾语从句置于宾语补足语之后，用it作形式宾语。
高中英语语法专题讲义：三大从句
名词性从句一、概念：在句中起名词作用的句子称名词性从句。
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。
1、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, why2、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。
例如：That she was chosen made us very happy. 她被选上了,我们很高兴。
We heard the news that our team had won. 我们听到消息说我们队赢了。
注：比较：whether与if均为"是否"的意思。
但在下列情况下,whether不能被if 取代：①whether引导主语从句并在句首②引导表语从句③whether 从句作介词宾语④从句后有"or not"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。
例如：It is not important who will go. 谁去,这不重要。
It is still unknown which team will win the match. 到底谁赢呢,形势尚不明朗。
3、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 he is still alive is sheer luck.他还活着全靠运气。
英语三大从句语法讲解
英语三大从句语法讲解 Document number：PBGCG-0857-BTDO-0089-PTT1998英语三大从句在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
定语从句一、关系代词引导的定语从句关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。
常见的关系代词有：who, that, which。
它们的主格、宾格和所有格如下表所示：（一）关系代词who, whom和 whose的用法who代替人，是主格，在定语从句中作主语。
An architect is a person who designs buildings. 建筑师是设计房屋的人。
whom代替人，是宾格，在定语从句作宾语，在非正式英语常可省略。
Do you know the gentleman whom we met in the school library yesterday 昨天我们在学校图书馆里遇到的那位先生你认识吗whose一般代替人，有时亦可代替物，是所有格，在定语从句作定语。
The girl student whose father is a senior engineer used to study abroad. 其父是一位高级工程师的那个女学生过去在国外留学。
Do you know the name of the hotel whose window we can see here 我们这儿能看到窗户的那个宾馆叫什么名字，你知道吗（关系代词whose指代先行词hotel，正式用法应该用of which。
whose window=the window of which，意思是：the window of the hotel。
）（二）关系代词which的用法which代替物，在定语从句作主语或宾语，作宾语时还可省略。
原题目：三大从句与动词不定式的语法规则
原题目：三大从句与动词不定式的语法规则三大从句与动词不定式的语法规则本文将介绍三大从句（名词性从句、定语从句和状语从句）以及动词不定式在语法中的规则和用法。
一、名词性从句名词性从句用作主语、宾语、表语或同位语，常有以下几种引导词：that, whether, if, who, whom, whose, which, what, whoever, whatever, whichever。
例：- 表语从句：The important thing is that we should try our best. （重要的是我们应该尽力。
）- 同位语从句：The fact that she is leaving surprised me. （她要离开的事实让我感到惊讶。
）二、定语从句定语从句用来修饰名词或代词，并与被修饰的词构成一定关系。
常用引导词有：who, whom, whose, which, that。
例：- 限制性定语从句（不可省略）：The book that you gave me is really interesting. （你给我的那本书真的很有趣。
）- 非限制性定语从句（可省略）：My sister, who is a doctor, works at the hospital. （我的姐姐是一名医生，她在医院工作。
）三、状语从句状语从句用来修饰谓语动词，表示时间、原因、条件、目的、结果等，常用引导词有：when, while, before, after, because, since, as, if, unless, although, though, whether, that, etc.例：- 时间状语从句：I will go shopping after I finish my work. （我完成工作后会去购物。
）- 条件状语从句：If it rains tomorrow, we will stay home. （如果明天下雨，我们会呆在家里。
初中英语3大从句：宾语从句，定语从句，状语从句详解
初中英语3⼤从句：宾语从句，定语从句，状语从句详解1宾语从句⼀、定义在句⼦中起宾语作⽤的从句叫做宾语从句。
⼆、连接词that: I think that you can pass the exam.Whether/if: I don’t know what the word means.“Wh”: I don’t know what the word means.I don’t know where he found the book.只⽤whether的情况：1. 与or not连⽤：I don’t know whether it’s raining or not.2. 与动词不定式连⽤：He doesn’t know whether to accept the invitation.3. 连接词前有介词时：It depends on whether he is coming.三、时态1. 主句是⼀般现在时态，从句根据实际情况⽽定(各种时态均可)She wants to know what he has done for the exam.2.主句是⼀般过去时态，从句⽤相应的过去的时态。
1）She said that she was a student.2）She said that she would fly to Japan in a week.3）She said that she had finished her homework already.3. 如果宾语从句说的是客观真理、⾃然现象或事实时，这时宾语从句要⽤⼀般现在时态。
The teacher said that the earth goes round the sun.2定语从句⼀、定义在复合句中修饰名词、代词的从句叫定语从句。
⼆、先⾏词先⾏词指⼈ who /that先⾏词指物 which/ that定语从句⼀般紧跟被修饰的名词或代词（即先⾏词）后三、关系代词关系代词代替先⾏词在句⼦中担当成分，所以从句中不可再出现其他代替先⾏词的代词四、翻译⽅法 “…. 的”Whom: 先⾏词指⼈，则代替先⾏词在定语从句中充当宾语（包括介词的宾语）, 与who的区别是如果前⾯带介词则必须⽤whom1. This is the teacher whomwho we like best.2. I don’t like the boy to whom you are talking.Whose : 指⼈或物，作定语，表⽰ “…的”eg: Harry is the boy whose mother is our math teacher.关系代词只能 that 的特殊情况：1.先⾏词前有序数词修饰时：This is the first gift that my parents bought me.2.先⾏词前有形容词最⾼级修饰时：This is the most exciting film that I have ever seen.3. 先⾏词是不定代词something, anything等时.e.g. Is there anything that you want in this shop4. 先⾏词是⼈和物时, ⽤that.e.g. He talked about some writers and books that were unknown to us all.5. 先⾏词被all , little , the only , the very(就是，正是), the last 等词修饰时,只能⽤thate.g. This is the last place that I want to visit.6. 特殊疑问句以who 或which 开头，只能⽤that引导.Who is the girl that is making a speech on the platform?当关系代词前使⽤介词时：物+介词+which ; ⼈+ 介词 + whom当关系代词前使⽤介词时：e.g. 1. This is the train by which we went to Beijing.2. This is the teacher to whom my mother is talking.3状语从句⼀、定义在复合句中由从句表⽰的状语称作状语从句，它可以⽤来修饰谓语（包括⾮谓语动词）、定语或状语，或是整个句⼦。
上海中考三大从句
中考英语语法——三大从句（宾语从句、定语从句、状语从句）:一、宾语从句宾语从句在句子中作为宾语，通常放在动词、介词或形容词后面。
三大考点：引导词、时态和语序。
其中，语序必须是陈述句语序。
1. 常由下面的一些词引导：●由that 引导，表示陈述意义，that可省略。
●由if ，whether 引导，表示一般疑问意义（带有是否、已否、对否等）。
●由连接代词、连接副词（疑问词）引导，表示特殊疑问意义。
2. 时态：主句用现在时或将来时，从句可用任何时态。
主句用过去时，从句用与过去相关的时态。
（1）从句说明的是一般真理、客观事实、自然现象、名言时，仍用现在时。
（2）从句中有具体时间状语，即使从句动作发生在主句动作前，仍用一般过去时。
【例】主句：I don't know.（我不知道。
）从句：if he will come.（他是否会来。
）解释：在这个例子中，“他是否会来”是宾语从句，作为“不知道”的宾语。
英文中，“if he will come”也起到了同样的作用，作为“don't know”的宾语。
二、定语从句定语从句在句中作定语，修饰一个名词或代词，被修饰的名词、词组或代词即先行词。
定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词：who，whom，whose，that，which。
关系副词有：where，when，why。
【例】主句：I like the book.（我喜欢那本书。
）从句：that is red.（那本红色的。
）解释：在这个例子中，“那本红色的”是定语从句，修饰名词“书”。
英文中，“that is red”是定语从句，修饰名词“book”。
三、状语从句状语从句在复合句中作状语，修饰主句中的动词、形容词或副词等。
状语从句放在主句前时，常用逗号隔开；放在主句后时，可以不用逗号；放在主句中间时，从句前后都要用逗号。
状语从句根据意义可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句。
(完整版)小学三大从句讲解
三大从句讲解一、宾语从句——完满句子做宾语You told me where you live.二、定语从句——完满句子做定语，修饰前面的名词I know the lady who is in pink.She gave me the book which is in English.三、状语从句——完满句子做状语，修饰动词或一整个句子I want be a doctor when I grow up.练习 1——判断以下从句种类1.You know how I feel.2.Can you tell me where my uncle is?3.I don’tknow the place you asked me.4.If you go abroad, I will go with you.5.I went to the restaurant where you asked me to.6.She is the lady who you are looking for.练习 2——请找出从句中含有的疑问词1.Sally told me where she would go.2.Do you know when she will be back?3.She is the person who(that) helped me a lot.4.This is the bike which(that) I bought last week.5.When he was a child, his parents went to America.6.Can she understand how we can pass the exam?练习 3——请依照上面的规律，填空。
1.Miss White is a teacher teaches us English.2.Tom gave me a present was a toy car.3.Can you tell my she lives?4.This is the book I lent you last week.5.My mother introduces a girl is in the same school to me.。
名词性从句、形容词性从句、副词性从句的语法知识点
在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
以下是一些基本的从句的语法知识点A、定语从句专项讲解与训练一、定语从句概念定语从句（attributive clause），顾名思义，就是一个句子作定语从属于主句。
定语一般是由形容词充当，所以定语从句又称作形容词从句。
另外，定语从句是由关系代词或关系副词引导的，故又称作关系从句。
定语从句一般放在它所修饰的名词或代词之后，这种名词或代词被称作先行词。
请看示例： The woman who lives next door is a teacher.先行词定语从句在所有的从句中，算定语从句最难掌握，因为汉语里没有定语从句，汉语里只有定语，而且总是放在名词之前来修饰名词。
二、关系代词引导的定语从句关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。
常见的关系代词有：who, that, which。
它们的主格、宾格和所有格如下表所示：格先行词主格宾格所有格人 who whom whose物 which whichwhoseof which人、物 that that —（一）关系代词who, whom和 whose的用法who代替人，是主格，在定语从句中作主语。
例如：An architect is a person who designs buildings. 建筑师是设计房屋的人。
I will never forget the teacher who taught us chemistry in the first year of my senior middle school. 我将永远不会忘记在高一时教我们化学的那位老师。
Anyone who wants to apply for this job must send us the resume by email first. 想应聘这个职位的任何人都必须先通过电子邮件向我们发送简历。
高中英语主要要掌握三大从句
高中英语主要要掌握三大从句分别是：1、定语从句（形容词从句）2、名词性从句（包括主语从句宾语从句表语从句同位语从句）3、状语从句（副词性从句包括时间地点结果目的原因等）一、定语从句：定语从句（Attributive Clauses）在句中做定语修饰一个名词或代词被修饰的名词词组或代词即先行词.定语从句通常出现在先行词之后由关系词（关系代词或关系副词）引出.1、关系代词引导的定语从句关系代词所代替的先行词是人或物的名词或代词并在从句中充当主语、宾语、定语等成分.关系代词在定语从句中作主词保持一致.（1）whowhomthat这些词代替指人“whom”作宾语指人“that”既可作主语又可作宾语（作宾语可以省略）可以指人也可以指物.（2）Which用来指人或物(用作主语、宾语作宾语时可以省略）（3）whose“whose”表示谁（可以为人也可以为物）的（东西）2、关系副词引导的定语从句（1）关系副词why主要用于修饰表示原因的名词（主要是the reason）同时它在定语从句中用作原因状语.（2）关系副词when主要用于修饰表示时间的名词同时它在定语从句中用作时间状语.（3）关系副词where主要用于修饰表示地点的名词同时它在定语从句中用作地点状语.3、非限制性定语从句它起补充说明作用缺少也不会影响全句的理解.在非限制性定语从句的前面往往有逗号隔开.二、名词性从句在句子中起名词作用的句子叫名词性从句 (Noun Clauses）.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.引导名词性从句的连接词可分为三类：1、连词（5个）：1）that（宾语从句或表语从句中that有时可以省略）2）whetherif （均表示“是否”表明从句内容的不确定性）3）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2、连接代词（9个）：whatwhateverwhowhoeverwhomwhomeverwhosewhichwhichever3、连接副词（7个）：whenwherehowwhywheneverwhereverhowever三、状语从句状语从句（Adverbial Clause）状语从句指句子用作状语时起副词作用的句子.它可以修饰谓语、非谓语动词、定语、状语或整个句子.根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句.状语从句一般由连词(从属连词)引导也可以由词组引起.从句位于句首或句中时通常用逗号与主句隔开位于句尾时可以不用逗号隔开.状语从句细分的话共包括九种：1.时间状语从句2.地点状语从句3.原因状语从句4.条件状语从句5.目的状语从句6.让步状语从句7.比较状语从句8.方式状语从句9.结果状语从句。
初中英语语法讲解--名词性从句、形容词性从句、副词性从句三大从句讲解
初中英语语法讲解：名词性从句、形容词性从句、副词性从句一、名词性从句1. 概念名词性从句是指在句子中起名词作用的从句，包括主语从句、宾语从句、表语从句和同位语从句。
2. 搭配与用法主语从句：作为句子的主语，通常使用连接词that（无实际意义，不可省略）或whether/if（表示选择，不可省略）引导。
例句：That he will come to the party remains uncertain.（他是否会来参加聚会还不确定。
）宾语从句：作为动词或介词的宾语，可以由that、if/whether、特殊疑问词等引导。
例句：I don't know if he will come.（我不知道他是否会来。
）表语从句：作为连系动词的表语，通常由that引导，但that通常可以省略。
例句：The fact is that he didn't come.（事实是，他没来。
）同位语从句：用于解释说明前面的名词，通常由that引导，但that不可省略。
例句：The news that he resigned was a surprise.（他辞职的消息是个惊喜。
）3. 注意事项宾语从句中，当主句的谓语动词是think、believe、expect、suppose等表示心理活动的动词时，如果宾语从句表示的是事实，则宾语从句的否定通常要转移到主句上来表达。
例句：I don't think he will come.（我认为他不会来。
）在名词性从句中，一般不使用疑问句语序，而是使用陈述句语序。
例句：Can you tell me how I can get to the park?（请告诉我如何去公园？）而不是Can you tell me how can I get to the park?二、形容词性从句（定语从句）1. 概念形容词性从句，也称为定语从句，用于修饰或限定一个名词或代词，描述这个名词或代词的性质或特征。
初中英语语法——三大从句汇总(重点笔记)
初中英语语法——三大从句汇总在英语中，主要有三大从句，即名词性从句〔包括主语从句，宾语从句，表语从句，同位语从句〕、形容词性从句〔即定语从句〕、副词性从句〔即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等〕。
以下是一些根本的从句的语法知识点A、定语从句专项讲解与训练一、定语从句概念定语从句〔attributiveclause〕，顾名思义，就是一个句子作定语附属于主句。
定语一般是由形容词充当，所以定语从句又称作形容词从句。
另外，定语从句是由关系代词或关系副词引导的，故又称作关系从句。
定语从句一般放在它所修饰的名词或代词之后，这种名词或代词被称作先行词。
请看例如：Thewoman wholivesnextdoorisateacher.先行词定语从句在所有的从句中，算定语从句最难掌握，因为汉语里没有定语从句，汉语里只有定语，而且总是放在名词之前来修饰名词。
二、关系代词引导的定语从句关系代词代替前面的先行词，并且在定语从句中充当句子成分，可以作主语、宾语、定语等。
常见的关系代词有：who,that,which。
它们的主格、宾格和所有格如下表所示：先行词主格宾格所有格人whowhomwhose物whichwhichwhoseofwhich人、物thatthat—〔一〕关系代词who,whom和whose的用法who代替人，是主格，在定语从句中作主语。
例如：Anarchitect is apersonwhodesignsbuildings .建筑师是设计房屋的人。
Iwillneverforgettheteacherwhotaughtuschemistryinthefirst1yearofmyseniormiddleschool.我将永远不会忘记在高一时教我们化学的那位教师。
Anyonewhowantstoapplyforthis jobmustsendustheresumebyemail first. 想应聘这个职位的任何人都必须先通过电子向我们发送简历。
三大宾语从句的用法及例句
三大宾语从句的用法及例句三大宾语从句分别是名词性从句、限制性从句和非限制性从句。
它们在英语句子中扮演着重要的角色，能够丰富句子结构，增加句子表达的多样性。
本文将对三大宾语从句的用法进行详细介绍，并给出相应的例句，以帮助读者更好地理解和掌握这一语法知识。
## 名词性从句### 用法名词性从句是一种用来充当名词的从句。
它可以在句子中担任主语、宾语、表语或同位语的角色，从而取代实际的名词，使句子更加简洁明了。
名词性从句包括了主语从句、宾语从句、表语从句和同位语从句。
1. 主语从句主语从句用来替代句子中的主语，在句中充当主语的角色。
主语从句通常由连接词that引导，但在口语中也可以省略。
2. 宾语从句宾语从句用于作及物动词的宾语，从而在句子中充当宾语的角色。
宾语从句常由连接词that引导，不过也可以由连接词whether或if引导。
3. 表语从句表语从句在句子中充当表语的角色，用来描述主语的性质、状态或身份。
表语从句常由连接词that引导，但在口语中也可以省略。
4. 同位语从句同位语从句用来对一个名词进行解释或说明。
它常常由连接词that引导，但也可以在某些情况下由whether或if引导。
### 例句1. 主语从句- That he is late is really annoying.（他迟到了真的很让人烦恼。
）- What she said is true.（她说的是真的。
）2. 宾语从句- I know that he is coming.（我知道他要来。
）- She asked me whether/ if I could help her.（她问我是否我能帮她。
）3. 表语从句- The important thing is that we are safe.（最重要的是我们平安无事。
）- His problem is that he is too lazy.（他的问题是他太懒了。
）4. 同位语从句- The news that he won the prize made me happy.（他获奖的消息让我很高兴。
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三大从句语法讲解从句：在复合句具有主谓部分但不能独立成句的句子。
主句：除掉从句，就是主句在英语中，主要有三大从句：名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）形容词性从句（即定语从句）副词性从句（即状语从句：包括时间、条件、结果、目的、原因、让步、地点、方式等）三大从句快速判断方法：1.主句不完整，从句不完整→名词性从句（连接代词）2.主句不完整，从句完整→名词性从句（连词、连接副词）3.主句完整，从句不完整→定语从句（关系代词）4.主句完整，从句完整→定语从句（关系副词）、同位语从句、状语从句名词性从句主语从句：（用句子代替名词来做主语）比如汉语中：①你通过我的方法学好了英语【主语】是我的荣幸。
②你要不要学英语【主语】是你自己的事。
③你想要的学习效果【主语】还必须靠你自己实现。
④你什么时候开始学英语【主语】是很重要的一件事。
基本：三类主语从句的连词（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.（你要赢得这样比赛看起来不可能。
）That she survived the accident is a miracle.（她能在这场事故中幸存真是个奇迹。
）这个就同我们汉语例子中的①句一样，只不过英语中更加重视句子结构，所以把that放在前头，告诉你这个that后面跟的句子（和里面的主谓宾）不影响主句。
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.（我们明天会不会在户外举办聚会取决于天气。
）Whether she is coming or not doesn’t matter too much.（她会不会来都没多大关系。
）这个就同我们汉语例子中的②句一样，whether就表示一种判断或者可能：是不是、会不会、要不要。
注：这里你会问了，为什么前面说了that whether if，讲了前两个，独独没讲if？因此才这里单独注明。
我们要注意到if和whether的词性是不同的，whether是代名词，本身就具备放在句首做主语的能力，而if是连词，是一种虚词，脱离了句子不具有完整的意思，所以我们在用if引导主语从句时，一般用形式主语。
如it is uncertain if he will leave for Beijing tomorrow.（他明天去不去北京（是）还不确定（的）。
）（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. ）这个就同我们汉语例子中的③句一样，唯一不同的是英语的区分比汉语更加明显。
（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.这个就同我们汉语例子中的④句一样。
高级：it 作形式主语的主语从句（就只是为了使句子看起来更美观，调整了句子的顺序而已。
）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。
这分四种情况：(1)对于以连词that引导的主语从句，通常用形式主语it替代主语从句：<a> 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。
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.<b> 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.It is doubtful whether she will be able to come.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.需要注意的是这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟语气。
<c> It is +过去分词+从句It is said that …据说……；It is reported that …据报道……；It has been proved that …已证明……；It must be 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 used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.<d> It seems不及物动词（happened / appears / d oesn’t’t matter / makes no difference / occurred …）that …主语从句不可提前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.(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。
(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？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)主语从句：记语序+记时态记语序无论主句是陈述句还是疑问句，宾语从句都必须使用陈述语序，即“主句＋连词＋宾语从句（主语＋谓语＋……）”句式。