高中英语从句总结
高中英语所有定语从句考点总结
高中英语所有定语从句考点总结定语可以由形容词、名词、代词、分词、不定式以及介词短语等来担任，也可以由一个句子来充当，充当定语功能的句子称为定语从句。
1.先行词：被定语从句所修饰的名词或代词①指人的先行词②指物的先行词★ 先行词还可以是前面整个句子所叙述的事情。
He has passed the driving test, which surprises all of us. (which替代前面所叙述的事情) 先行词2.关系词：引导定语的词(1)关系词的作用①替代前面的先行词（替代作用）②连接主句和定语从句（连接作用）③在定语从句中作句子成分（成分作用）(2)关系词的分类①标准：根据关系词在从句中做的句子成分种类②关系代词：在从句中做 主，宾，表，定（that/which/who/whom/whose/as）③关系副词：在从句中作状语(When/where/why)3.定语从句：用来做定语，修饰限定先行词的句子1.限制性定语从句：对先行词起限定修饰作用。
He is a teacher who works at our school.2.非限制性定语从句：对先行词起补充说明作用(先行词与定语从句之间有逗号隔开)Beijing, which is the capital of China, is a beautiful city with a long history.比较：He has two sons, who work in the same company.(He has only two sons.)He has two sons who work in the same company.(Perhaps he has two more sons)1.关系代词的省略(限定性定语从句)(1)关系代词在定语从句中作宾语She is the girl (whom / that) I loved before. (可以省略whom/that)(2)关系代词在定语从句中作表语He is no longer the boy (that) he used to be. (可以省略that)(3)关系代词作介词宾语，介词在从句句尾时可以省略Housing price is a problem (that/which) people are interested in.比较：Housing price is a problem in which people are interested.（此时只能用which且不能省略） 2.先行词是人(that/who的区别)(1)用that的情况①以疑问词who开头的句子中Who is the man that is shouting there?②关系代词在从句中作表语时She is not the girl that she used to be.③先行词被the very, the right, the only修饰This is the very person that we are looking for.(2)用who的情况①先行词是one, ones, anybody, all, none, those 等Those who want to go to the cinema will have to wait at the gate of the school.②句子中有两个定语从句,一个用了that,另外一个用whoWho is the boy that won the gold medal?③在there be 结构中There are many young men who are against him.④在非限定性定语从句当中Tom, who is my best friend, has gone abroad to study.3.先行词是物(that / which的区别)(1)用which的情况①在非限定性定语从句中She lost the game, which depressed her greatly.②关系词置于介词之后，作宾语The pen with which you write is Jack’s.Let me show you the novel that I borrowed from the library which is newly open to us.(2)用that的情况①先行词是不定代词如all, little, few, much,anything, everything, nothing, none, no one等She did all that she could to help us.②先行词被all, every, no, some, little, much, the only, he very, the right，the last等所修饰时This is the very book that I want.③先行词中既有人又有物时She described in her compositions the people and he places that impressed her most.④先行词前有序数词或形容词最高级修饰时This is the best book that I have ever read.This is the first film that I’ve seen since I came here.⑤定语从句中套定语从句，其中一个关系词以用which, 另外一个用thatHe built a factory which produced things that had never been seen before.⑥当主句的主语是疑问词which,另一个用thatWho is the person that is standing at the gate?4.As引导定语从句用法(1)As 既可以引导限制性定语从句也可以用于非限定性定句中充当主语，宾语，表语等。
高中英语从句语法总复习
定语从句常考知识在复合句中修饰名词或代词的从句叫定语从句..被修饰的名词或代词叫先行词..通过从句的意思判断先行词..引导定语从句的关系代词有who;whom;whose;which;that等和关系副词where;when;why等..一、非限制性定语从句记：有逗号的从句;连接词一定不用that..典型例题They will fly to Washington;_________ they plan to stay for two or three days.A.whereB.thereC.whichD.when二、关系代词who;whom;whose引导的定语从句这类定语从句中;who在从句中用作主语;whom从句中用作宾语;whose从句中用作定语注意：Whose既可代表人;也可代表物eg：Do you see the house whose windows are all broken三、关系代词that和which引导的定语从句1、只能用which的情况1介词+which2非限制性定语从句2、只能用that的情况1先行词为不定代词all;nothing;much等2两个the：先行词为序数词和最高级3人和物同时做先行词时4先行词被the only;the very修饰时3、“介词+which/whom”中介词的选择关系代词前的介词使用时根据与名词前面的动词搭配关系和介词的搭配关系及句子结构上的需要而定..eg：We`ll never forget the day on which we went camping.四、关系副词when;where;why引导的定语从句1、when;where;why=介词+which;有时为表达清楚;还可在关系副词where、when前加介词from;to..Reason Why= reason for which2、关系副词和关系代词的比较记：从句的句子是完整的连接词一定用关系副词3、高考对关系副词where的考查高考中对where的考查趋于复杂;先行词由“明显的地点”转为“地点的模糊化”..Where 不能只理解为表地点;当先行词表示某人/物的处境situation;或某事所发展的阶段;或表达某事的某个方面part;point时都可用where这个关系副词..例词：Place地点 Case案例 Situation形势 Point点 Top顶点 Position地位Stage阶段 Occasion场合 Aspect方面…….五、关系代词as;which的区别As主要用于as…as；the same as…；such as…等结构中..译为“正如”..as 引导非限制性的定语从句;修饰前面整个句子;而which均可..eg：The meeting;which was held in the park;was a success.eg：The meeting was a success;as was expected.典型例题1My friend showed me round the town; was very kind of him.A. whichB. thatC. whereD. it2The Beatles;________ many of you are old enough to remember;came from Liverpool.A.whatB.thatC.howD.as六、way的特殊用法The way that/which/不填 he explained to us was quite simple.The way that/in which/不填 he explained the sentence to us was not difficult to understand.考点剖析命题规律：1关系代词的辨析及关系副词的辨析..2关系代词的指代情况3定语从句的主谓一致问题..例题：规律总结：定语从句一般考连接词;一般分三步完成..1、判断定语从句的先行词和理解从句意思..2、看从句是否完整;完整一定用关系副词..3、不完整的……1关系代词和关系副词的辨析;判断从句是否完整;完整的连接词一定用关系副词.. eg：This is the farm where he works.eg：This is the farm which he visits.遇到situation;part;point;place;period等;一般连接词用where..遇到time;age;day等;一般连接词用when..介词后一定不加that;注意介词的判断..介词+which/whom不用who..关系副词=介词+which2非限制性定语从句及有逗号的从句;一定不用that特别注意先行词为整个句子时.. which;that的一些特殊用法..作宾语的关系代词可省略3定语从句的两个特殊句型Is this school we visited that yearIs the school we visited that yearIs this the school we visited that year名词性从句常考知识一、名词性从句的结构和功能总述名词性从句包括主语从句、宾语从句、表语从句、同位语从句..具有名词性功能..名词性从句主要有四种从句结构：以that引导的从句；以whether/if 引导的从句；以特殊疑问词引导的从句；以what或wh-ever等连接代词引导的名词性关系从句..主语从句宾语从句表语从句同位语从句作及物动词宾语作介词宾语that 一般不省略可以省略一般不省略一般不省略一般不省略whether/if是否放于句首时只用whether 用whether/if均可;但有区别只用whether 只用whether 只用whether特殊疑问词注意语序要用陈述语序名词性关系从句注意语序要用陈述语序典型例题1Can you tell me ________________我如何去get to the railway station2These photographs will show you _____________________________我们村上看上去是什么样子的..二、that从句一主语从句1、that从句作主语时;常用it作形式主语;常见的句型有：1It+be+形容词obvious;true;natural;surprising;good;wonderful;funny;possible;likely;certa in;probable…+that从句..eg：It is certain that she will do well in her exam. 2It+be+名词词组no wonder;an honor;a good thing;a pity;no surprise…+that 从句..eg：It`s a pity that we can`t go.3It+be+过去分词said;reported;thought;expected;decided;announced;arranged…+that从句.. eg：It is said that Mr.Green has arrived in Beijing.4It+不及物动词+that从句eg：It seems/happens/appears/turns out/doesn`t matter…that…注意：It ishightime that we got down to work.It is the first time that I have come to Beijing.2、that连接词位于句首时;不能省略..eg：That we are invited to a concert this evening is good news to us.二宾语从句1、常见的可接that从句作宾语的动词有see;say;know;imagine;discover;believe;tell;show;think;consider;be sure;be afraid…可省略..在可以接复合宾语的动词之后;如think;make;consider等;可用it 做形式宾语..eg：He has made it clear that he will not give in.eg：We consider it necessary that he should improve his pronunciation.2、that从句一般不能充当介词宾语;但可作except;in等介词的宾语..其他介词后需用that时;必须用it作形式宾语..eg：You may depend on it that I shall always help you.三表语从句that引导表语从句时;不可省略..eg：My decision is that all of us are to start at 6 o`clock tomorrow morning.四同位语从句连词that引导的同位语从句;在从句中不担当任何成分;不省略..应在某些有内容的名词之后;如：fact;hope;desire;thought;suggestion;idea;news;problem;possibility等..eg：There`s a feeling in me that we`ll never know what a UFO is—not ever.三、whether/if是否一在表语从句和同位语从句中只能用whether不能用if；当主语从句放于句首时;也只能用whether不用if；当it作形式主语;主语从句放在句末时用whether或if均可..eg：Whether the meeting will be given is still a problem.eg：It is doubtful whether/if he will come here.eg：The problem is whether the meeting will be given.eg：I have no idea whether the meeting will be given.二在宾语从句中：介词后只用whether;不用if..eg：I depends on whether you can do the work well.典型例题1_________we`ll go camping tomorrow depends on the weather.2I am not sure_______ he will come here or not.3This decision will have effect on ______ or not he will succeed.四、特殊疑问词一主语从句特殊疑问词引导主语从句时;常用it作形式主语..eg：It makes no difference where we shall have the meeting.二宾语从句1、能接特殊疑问词引导的宾语从句的动词很多;常见的有：see;tell;ask;answer;know;decide;findout;imagine;suggest;doubt;wonder;show;discuss;understand;inform;advise等. eg：I can`t imagine how he did it.eg：They couldn`t understand why I refused it.2、作介词宾语..eg：It all depends on how we solve the problem.eg：We are worrying about what we should do next.三表语从句、同位语从句eg：The problem is where we should stay.eg：My question how I shall get in touch with him has not been answered.五、名词性关系从句What是最常用来引导名词性关系从句的关系代词..what=the things which/that;whoever=anyone who;whichever=anyone/anything that;whatever=anything that.Where=the place where;when=the time when.三表语从句eg：This is where our problem lies.eg：Tomorrow is when it would be most convenient.四同位语从句eg：I gave the girl a big doll;exactly what she longed to have.五名词性关系从句还可作宾语补足语eg：We`ll make him whatever he is fit for.eg：I`ll call the baby whatever name you like.eg：He has made the company what it is today.六、名词性从句的几个难点一wh-ever与no matter wh-的用法区别;wh-ever放句首句中; no matter wh-放句首wh-ever既可引导名词性从句;又可引导让步状语从句；而no matter wh-只能引导让步状语从句..eg：Whatever I said;he wouldn’t listen to me.=No matter what I said;he wouldn’t listen to me.eg：He would believe whatever I said.另外;whoever;whatever;whenever;wherever中;ever起强调作用;意为“究竟、到底”..二as if/as though;because;why也可引导表语从句..eg：It looked as if it was going to rain.三连词that引导的同位语从句和关系代词that引导的定语从句的区别1、连词that引导同位语从句时;应放在某些具有内容的名词之后;如fact;hope;desire;thought等;对前面的名词起补充说明的作用..只起引导的作用;在从句中不担当任何成分;因此that引导的同位语从句是完整的..2、关系代词that引导定语从句时;在定语从句中担当成分主、宾;that引导的定语从句时残缺的..eg：The news that our football team won the match was encouraging.eg：The news that we heardon the radio was not true.并列句和状语从句并列句1、表递进关系：and;not only…but also…;neither…nor…;not…but…2、表示选择关系：常用的并列连接词有or;either…or…;otherwise等..3、表转折关系：but;yet;whereas;while等..4、说明关系：so;for..5、while “而;却”表对比..典型例题1_______ I accept that he is not perfect;I do actually like the person.2Follow the doctor`s advice;_______ your cough will get worse.3He was just going to sleep______ he heard someone shout“FireFire”.4She is seriously ill;_______she doesn`t give up hope.5He is a good teacher;_______ he is very popular with students.6_______ does he do well in English;but he does well in maths.状语从句时间状语从句一、when、while、as1、when既可以引导一个持续动作、也可以引导一个短暂动作..2、从属连词while引导的动作必须是持续性的;侧重主句动作和从句动作相对比..3、连词as可表示“一边…;一边…”或“随着…”..eg：When/While/As I was walking down the steet;I came across an old friend of mine.二、as soon as;immediately;directly;instantly;the moment;the minute;the instant;no sooner…than…;hardly/scarcely…when…和once一…就…eg：The moment I heard the voice;I knew father was coming.eg：No sooner had we arrived at the station than the train left.eg：The boy burst into tears immediately he saw his mother.注意：I had hardly got home when it began to rain.Hardly had I got home when it began to rain.三、till;until;not…until1、肯定句：主句动词必须是延续性动词;意为|“某动作一直延续到某时间点才停止”.. eg：He remained there until she arrived.eg：You may stay here until the rain stops.2、否定句：主句动词必须是非延续性动词;意为“某动作之道某时间才开始”.. eg：He won`t go to bed till/until she returns.3、till不可以置于句首;而until可以..eg：Until you told me I had no idea of it.4、not…until 句型中的强调和倒装用法：1It was not until you told me that I had any idea of it.强调2Not until you told me did I have any idea of it.倒装典型例题句型转换：I didn`t leave until she came back.1_______ ________ she came back _______ _______ leave.2_______ _________ not until she came back _______ I ________.四、before和since1、若表达“还未…就…；不到…就…；…才…；还没来得及”时;需用连词before.. eg：We had sailed four days and four nights before we saw land.2、before从句中谓语不用否定式..eg：Before they reached the station;the train had gone.3、It will be+一段时间+before…多久之后才…eg：It will be half a year before I come back.eg：It won`t be long before we meet again.4、since从句一般过去时的动词一般是非延续性动词;主句的动词现在完成时或现在完成进行时时延续性或反复发生的..5、在“It is+一段时间+since从句”句型..eg：It is three years since the war broke out.五、every time;each time;next time;the first time;any time;all the time等;表示“每当…；每次…；下次…”等..eg：Every/Each time I was in trouble;he would come to help me out.eg：Next time you come;do remember to bring your son here.eg：The last time she saw James;he was lying in bed.地点状语从句和原因状语从句一、地点状语从句1、引导地点状语从句的从属连词where;wherever指具体地点时..2、注意区分where引导的定语从句和状语从句：You`d better make a mark where you have any questions.You`d better make a mark at the place where you have any questions.二、原因状语从句1、引导的连词有：because;as;since;now that;seeing that;considering that.. Because 主句前或后直接因果关系语气强能回答whyAs 主句前或后双方都知道的原因不能回答whySince/now that 主句前双方都知道的原因eg：—Why are you absent from the meeting —Because I am ill.eg：As it is raining;we shall not go to the park.eg：Now that/Since everybody is here;let`s begin our meeting.2、其他表原因的方式Because of;thanks to;due to;owing to等..for He doesn’t know about it;for he didn`t see the film.目的状语从句和结果状语从句一、目的状语从句连词有：so that;in order that;for fear that;in case;lest等..1、in order that与so thateg：I`ll speak slowly so that you can understand me.eg：In order that we might see the sunrise;we started for the peak early. 2、for fear that;in case和lest从句中动词要用should+动词原形;本身带有否定意义eg：The boy hid himself behind the tree in case/for fear that his father should see him.eg：Take your raincoat in case/lest it should rain.二、结果状语从句引导结果状语从句的连词：so that;such thateg：Mike is such an honest worker that we all believe him.=Mike is so honest a worker that we all believe him.当so或such置于句首;主句要用倒装语序..eg：So clever a student was he that he was able to work out all the difficult problems.典型例题句型转换：He is so young that he can`t join the army.1He is_____ _____ ______ to join the army.2He is _____ _____ to join the army.3He is so young _____ _____ _____ join the army.条件状语从句和方式状语从句一、条件状语从句连词有：if;unless;so/as long as;in case;on condition that..eg：You`ll fail the exam unless you study hard.eg：As long as you don`t loseheart;you will succeed.eg：In case ther is a fire;what will we do first二、方式状语从句连词：as;as if;as thougheg：Do as you are told to;or you`ll be fired.eg：The old lady treats the boy as if he were her own son.eg：I feel as if I have a fever.让步状语从句和比较状语从句让步状语从句1、although/though;even though/even ifeg：He is unhappy;though/although he has a lot of money.eg：Although/though it was raining hard;yet they went on playing football. eg：Even though/if it is raining;we`ll go there.注意：though作“可是;然而”;句末eg：He said he would come;he didn`t;though.2、as或though引导的让步状语从句倒装的情况eg：Child as he is;he knows a lot.eg：Much as I like it;I won`t buy it;for it`s too expensive.3、whether…or…不管…还是…；疑问词+ever与no matter+疑问词eg：Whether you believe it or not;it is true.eg：Whatever you say;he won`t believe you.eg：Whoever you are;you must obey the rules.注意：whoever;whatever;whichever等还可引导名词性从句..eg：You can take whatever you like.4、while 然而eg：While I admit that there are problems;I don`t agree that they cannot be solved.典型例题1I`ll be your true friend; ______ happens.A.whateverB.no matter what2______ I see him; he is busy with his research work..A.WheneverB.No matter when3He liked reading very much.______ he went;he took a book with him.A.WhereverB.No matter where4______ difficult the problem may be ;I`ll work it out by myself.A.However B no matter how5I won`t let you in;______ you may be.A.whoeverB.no matter who6______ leaves the room last should remember to turn off the light.A.WhoeverB.No matter who7I`m too busy to buy you a present;wo you can use the money I give you to buy ______ you like.A.whateverB.no matter what8I`ll give the ticket to ______ really wants to see the film.A.whoeverB.whomeverC.no matter who状语从句的紧缩现象一、时间状语从句中常见的紧缩Don`t speak until spoken to.While in Beijing;I paid a visit to the Summer Palace.二、条件状语从句中常见的紧缩Come tomorrow if possible.If so;you must go back and get it.I`ll buy a TV set if necessary.三、方式状语从句中常见的紧缩She stood at the gate as if waiting for someone.The woman teacher left the classroom silently as though angry.四、其他状语从句中的紧缩Though cold;he still wore a shirt.Being blind;he couldn`t see anything.who。
高考英语 高中英语三大从句知识点 附例句
高考英语高中英语三大从句知识点附例句1. 名词性从句：作为主语、宾语、表语或同位语，常用连接词有that, whether, if, who, whom, whose, what, which等。
例句：- What he said is true.（他说的是真的。
）- I don't know whether he will come or not.（我不知道他会不会来。
）- She asked me if I had finished my homework.（她问我是否完成了作业。
）2. 定语从句：修饰名词或代词，常用连接词有that, who, whom, whose, which等。
例句：- The book that I borrowed from the library is very intere sting.（我从图书馆借的那本书非常有趣。
）- The girl who is standing over there is my sister.（站在那边的女孩是我的妹妹。
）- The car, which is parked outside, belongs to my neighbor.（停在外面的那辆车是我邻居的。
）3. 状语从句：表示时间、条件、原因、结果、让步等，常用连接词有when, while, before, after, since, until, if, unless, because , since, as, so that, in order that, although, though等。
例句：- I will call you when I arrive at the airport.（我到机场后会给你打电话。
）- If it rains tomorrow, we will stay at home.（如果明天下雨，我们会呆在家里。
）- He failed the exam because he didn't study hard.（他考试不及格是因为他没有认真学习。
高中英语知识点归纳从句的分类与用法
高中英语知识点归纳从句的分类与用法从句是英语中十分重要的语法结构之一。
它可以在句子中充当名词、形容词或副词的作用。
了解从句的分类和用法对于理解和运用英语非常有帮助。
本文将对高中英语中的从句分类和用法进行归纳总结。
一、名词性从句名词性从句可以在句子中作主语、宾语、表语或同位语等，常见的名词性从句有以下几种：1. 主语从句主语从句在句子中作主语，常以连接词that或whether引导。
例如：- That he has passed the exam is good news.- Whether she will come to the party is still uncertain.2. 宾语从句宾语从句在句子中作宾语，常以连接词that或wh-引导。
例如：- She said that she would be there on time.- I don't know what his name is.3. 表语从句表语从句在句子中作表语，常以连接词that或wh-引导。
例如：- My biggest hope is that we can achieve success together.- The question is whether she will accept the job offer.同位语从句用来对某个名词或代词进行解释或说明，常以连接词that引导。
例如：- The fact that he broke his promise disappointed me.- Her announcement that she was going to retire surprised everyone.二、形容词从句形容词从句用来修饰名词或代词，常以连接词that, which, who, whom, whose, when, where, why等引导。
例如：- The book that I borrowed from the library is very interesting.- I know a girl whose father is a famous actor.三、副词从句副词从句用来修饰动词、形容词或副词，常以连接词that, if, whether, because, although, when, where, how等引导。
高中英语语法归纳总结从句
高中英语语法归纳总结从句从句是英语语法中的一个重要部分。
它能够在句子中充当名词、形容词或副词的作用，增强句子的表达力和多样性。
本文将对高中英语语法中的从句进行归纳总结，帮助学生们更好地理解和应用从句。
一、名词性从句名词性从句可以在句中担任主语、宾语、表语和同位语的角色。
常见的名词性从句有以下几种类型。
1. 主语从句主语从句在句中充当主语的角色，常以“that”或“whether/if”引导。
例如：“What you said doesn't make sense.”（你说的话毫无意义。
）主语从句的引导词可以省略，直接使用动词来引导，例如：“To forgive is to forget.”（宽恕就是忘记。
）2. 宾语从句宾语从句在句中作为动词的宾语，常以“that”或连接词引导，例如：“He said that he would come.”（他说他会来。
）宾语从句的引导词可以根据从句的内容来选择，如“whether/if”、“when”、“where”等。
3. 表语从句表语从句在句中充当表语的角色，常以“that”引导，例如：“The fact is that he is ly ing.”（事实是他在说谎。
）4. 同位语从句同位语从句用来解释或说明名词的具体内容，常以“that”引导，例如：“The news that he won the prize surprised everyone.”（他获奖的消息让每个人都感到惊讶。
）二、形容词从句形容词从句用来修饰名词，常以“that”或“which”引导。
形容词从句通常紧跟在被修饰的名词之后。
例如：“The book that he recommendedis very interesting.”（他推荐的那本书非常有趣。
）三、副词从句副词从句可以修饰动词、形容词或副词，并且可以表示时间、地点、原因、方式、条件等。
常见的引导词有以下几种。
高中英语语法总结句式归纳
高中英语语法总结句式归纳高中阶段是学习英语语法的重要时期，掌握各种语法句式对于提高英语写作和口语表达能力至关重要。
本文将总结和归纳高中英语常用的语法句式，以帮助同学们更好地掌握英语语法知识。
一、名词性从句名词性从句在句子中起着名词的作用，可以作主语、宾语、表语或补语。
常见的名词性从句有以下几种句式：1. 主语从句主语从句常用来引导主句的主语，一般用以下几个连接词引导：that, whether, if。
例如：- That he is a brilliant student is undeniable.（他是一个优秀的学生是不可否认的。
）- Whether she will come to the party is still uncertain.（她是否会来参加派对还不确定。
）2. 宾语从句宾语从句常用来作主句的宾语，一般用以下几个连接词引导：that, whether, if。
例如：- I don't know if she can finish the task in time.（我不知道她是否能按时完成任务。
）- He asked me whether I had seen the movie.（他问我是否看过那部电影。
）3. 表语从句表语从句常用来作主句的表语，一般用以下几个连接词引导：that, whether。
例如：- My biggest concern is that we won't have enough time.（我最担心的是我们没有足够的时间。
）- The question is whether they will come to the meeting.（问题是他们是否会来开会。
）4. 同位语从句同位语从句用来解释或说明名词的内容，常用连接词that。
例如：- The fact that he won the competition surprised everyone.（他赢得比赛的事实让大家都感到惊讶。
高中英语从句知识点集合
高中英语从句知识点集合第一章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. 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。
1.1 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。
被强调部分指人时也可用who/whom。
例如：a) It is a pity that you didn’t go to see the film. 你不去看那场电影真可惜。
b) It doesn’t interest me whether you succeed or not. 我对你成功与否不感兴趣。
c) It is in the morning that the murder took place. 谋杀案是在早上发生的。
(强调句型)d) It is John that broke the window. 是John 打碎的窗户。
(强调句型)1.2 用it 作形式主语的结构用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…It appears that… 似乎…(4) It + 过去分词+ 从句It is reported that… 据报道…It has been proved that… 已证实…It is said that… 据说…1.3 主语从句不可位于句首的五种情况：(1) i f 引导的主语从句不可居于复合句句首。
高中英语状语从句用法详解
高中英语状语从句用法详解内容提要：一、时刻状语从句二、地点状语从句三、方式状语从句四、程度状语从句五、缘故状语从句六、结果状语从句七、目的状语从句八、条件状语从句九、让步状语从句十、比较状语从句一、时刻状语从句:1、时刻状语从句通常用下列从属连词来引导：after, before, as, once, till, until, (ever) since, when, whenever, while, now (that), as long as, as soon as。
如：Now (that) you’ve grown up, you must stop this childish behaviour.Whenever we met with difficulties, they came to help us.Come and see us whenever you have time.People do not know the value of health till they lose it.2、有些词，如immediately, directly, instantly 等，当用于as soon as 意义时，也能够引导时刻状语从句，如：I got in touch with him immediately I received his letter.My sister came directly she got my message.The machine will start instantly you press the button.I’ll telephone you directly I hear the news.Will you look for it immediately you get there?3．某些表示时刻的名词词组，如the (very) moment ( = as soon as ), the minute ( = as soon as ), the instant ( = as soon as ), the day, theyear, the morning, every time, each time, next time, the first time 等，也能够引导时刻状语从句，如：I’ll tell you about it the moment you come.I started the instant I heard the report.The instant she saw him she knew he was her brother.Every time I catch a cold, I have pain in my back.I’m going to see him next time he comes to Shenzhen.He left Europe the year World WarⅡbroke out.He had impressed me that way the first time I met him.I started the very moment I got your letter.I’ll tell him the minute (that) he gets here.4．有些关联从属连词，如no sooner …than / hardly …when / sca rcely …when / barely …when 等，也能引导时刻状语从句。
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高中英语从句总结1）主语从句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：（1）从属连词that.如：That they were in truth sisters was clear from the facial resemblance between them.很明显，她们确是亲姐妹，她们的脸型很相似。
（2）从属连词whether.如：Whether he’ll come here isn’t clear.他是否会来这里还不清楚。
（3）连接代词who，whom，whose，what，which，whoever，whatever，whichever 连接副词 where，when，how，why.如：What she did is not yet known.她干了什么尚不清楚。
How this happened is not clear to anyone.这事怎样发生的，谁也不清楚。
Whoever comes is welcome.不论谁来都欢迎。
Wherever you are is my home —— my only home.你所在的任何地方就是我的家——我唯一的家。
解释：1.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：+be+形容词（obvious，true，natural，surprising，good，wonderful，funny，possible，likely，certain，probable，etc.）+that从句。
如：It is certain that she will do well in her exam.毫无疑问她考试成绩会很好。
It is probable that he told her everything.很可能他把一切都告诉她了。
+be+名词词组（no wonder，an honor，a good thing，a pity，no surprise，etc.）+that从句。
如：It’s a pity that we can’t go.很遗憾我们不能去。
It’s no surprise that our team should have won the game.我们没赢这场比赛真意外。
+be+过去分词（said，reported，thought，expected，decided，announced，arranged，etc.）+that从句。
如：It is said that has arrived in Beijing.据说格林先生已经到了北京。
It is reported that China has sent another man-made earth satellite into orbit.据报道中国又成功地发射了一颗人造地球卫星。
+seem，happen等不及物动词及短语+that从句。
如：It seems that Alice is not coming to the party at 似乎不来参加晚会。
It happened that I was out that day.碰巧我那天外出了。
+doesn’t matter（makes no difference，etc.）+连接代词或连接副词引起的主语从句。
如：It doesn’t matter whether she will come or not.她是否来这无关紧要。
It makes no difference where we shall have the meeting.我们在哪里开会毫无区别。
F.当that引导的主语从句出现在疑问句中时，要以it作形式主语，而把主语从句后置。
如：Is it true that the scientist will give us a lecture next week？下周那位科学家将给我们作报告是真的吗？Does it matter much that they will not come tomorrow？他们明天不来很要紧吗？G.当主语从句出现在感叹句中时，要以it作形式主语，而把主语从句后置。
如：How strange it is that the children are so quiet！孩子们这么安静真奇怪！2.注意连接代词whoever，whatever，whichever等引导主语从句的含义。
Whoever comes will be welcome.（whoever=the person who）来的人将受到欢迎。
Whatever he did was right.（whatever=the thing that）他所做的事情是正确的。
Whichever of you comes in will receive a prize.（whichever=anyone of you who）你们当中不论哪个进来将会得到奖2）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 it was 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。
That was what she did this morning on reaching the attic.那就是她今晨上了阁楼干的。
解释：1.连词because可引导表语从句。
如：I think it is because you are doing too much.我想这是因为你做得太多。
2.在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。
should+动词原形表示，should可省略。
如：My suggestion is that we （should）start early tomorrow.我的建议是我们明天一早就出发。
3）宾语从句1.定义：用作宾语的从句叫宾语从句。
2.构成：关联词+简单句。
3.引导宾语从句的关联词有三类：（1）从属连词that.如：He told us that he felt ill.他对我们说他感到不舒服。
I know he has returned.我知道他已经回来了。
注： that在引导宾语从句时也并不是任何情况下都可以省略。
在以下情况下，that 不能省略。
could see what happened and that Tom was frightened.（and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。
）大家都会看出所发生的事情并知道Tom非常害怕。
know nothing about him except that he is from the south.（that引导的宾语从句作介词宾语时，that不能省略。
）对他我一无所知，只知道他是南方人。
he ever said such a thing I simply don’t believe.（that从句位于句首时，that不可省略。
）我简直不相信他曾说过这样的话。
decided，in view of his special circumstances，that we would admit him for a probationary period.（主句谓语动词与that从句之间有插入语，that不可省略。
）鉴于他的特殊情况，我们决定应允他一段试用期。
（2）从属连词if/whether.如：I doubt whether he will succeed.我怀疑他是否会成功。
I don’t know if you can help me.我不知道你能否帮助我。
（3）连接代词who，whom，whose，what，which，whoever，whatever，whichever 连接副词 where，when，how，why.如：Who or what he was，Martin never learned.他是什么人？他是干什么的？马丁根本不知道。
I wonder what he’s writing to me about.我不知道他要给我写信说什么事。
I’ll tell you why I asked you to come.我会告诉你我为什么要你来。
You may do what you will.你可做任何你想做的事。
（1）介词宾语从句宾语从句也可用作介词的宾语。
如：He was deeply displeased by what had occurred that day.他对那天发生的事感到很不快。
I walked over to where she sat.我走向她坐的地方。
I am curious as to what he will say.我很想知道他要说什么。
Your success will largely depend upon what you do and how you do it.你是否成功将主要取决于你做什么和怎样做。
有时介词可以省略。
如：I don’t care （for）who marries him.我不管谁跟他结婚。
Be careful （as to）how you do that.你要注意做这件事的方式。