名词性从句精讲精析
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名词性从句讲解(最全版)名词性从句是一个从句,它在句子中充当名词的角色。
它可以作为主语、宾语、表语、同位语或介词宾语。
名词性从句通常由连接词引导,如that、whether、if、who、whom、whose、which、what等。
1. 作为主语:名词性从句可以作为主语,取代一个名词或名词短语,引导词通常为that或whether。
例如:- What you said is true.(你说的是真的。
)- Whether he will come is still uncertain.(他是否会来还不确定。
)2. 作为宾语:名词性从句可以作为及物动词或介词的宾语,引导词通常为that、whether、if、who、whom、whose、which、what等。
例如:- She asked me what I wanted.(她问我想要什么。
)- I don't know if/whether he will come.(我不知道他是否会来。
)3. 作为表语:名词性从句可以作为系动词的表语,引导词通常为that、whether、who、whom、whose、which、what等。
例如:- The problem is that she doesn't understand.(问题在于她不理解。
)- The question is who will take care of them.(问题是谁会照顾他们。
)4. 作为同位语:名词性从句可以作为同位语,解释或说明前面的名词或代词,引导词通常为that、whether、who、whom、whose、which、what等。
例如:- The fact that he lied surprised me.(他撒谎的事实让我感到惊讶。
)- His belief that she will succeed is unwavering.(他坚信她会成功。
英语语法总结全集名词和主谓一致一、名词的分类英语中名词主要可以分为可数名词和不可数名词。
1.可数名词可数名词一般都有单复数。
单数时,名词前可加不定冠词a/an;复数时,前面可加数词,名词本身要改成复数形式。
可数名词的复数有规则和不规则两种变化。
规则的名词,只要在单数名词之后加“s”,“es”或去“y”加“ies”就行,如:an umbrella, twelve umbrellas;a factory, three factories。
不规则的名词变化则要靠积累记忆,如:a mouse, ten mice;a policeman, six policemen。
有少数可数名词,如sheep,works(工厂),Chinese等,它们的单复数同形:a sheep, four sheep;a chemical works, five chemical works。
此外,还有一些可数名词只有复数形式,如clothes,trousers,cattle,police,people(人,人民)等。
英语名词中还有一些合成词,它们的复数形式有三种可能:1)后面的部分变成复数形式:grown-ups,boy students,grandchildren。
2)前面的部分变成复数形式:passers-by,lookers-on,sons-in-law。
3)前、后都变成复数形式:men doctors,women drivers。
2.不可数名词不可数名词没有单复数的变化,前面也不能加a/an,或数词。
但是我们可以用量词来表示不可数名词的数量,单复数表现在量词上,如:a piece of paper;two pieces of paper。
在有些情况下,不可数名词也可用a/an,表“一种”、“某种”的意思,如have a wonderful time,receive a good education,be made into a fine paper。
专题14 名词性从句——精讲深剖一.单句语法填空1.(2019全国卷I)While they are rare north of 88°,there is evidence they range all the way across the Arctic,and as far south as James Bay in Canada.【答案】that【解析】考查同位语从句。
根据句子结构分析可知,主句为there be句型,且结构完整,空格后为同位语从句,解释说明中心词evidence的内容,故填that。
2. (2018全国卷III)I'm not sure 61 is more frightened,me or the female gorilla (大猩猩) that suddenly appears out of nowhere.【答案】who【解析】考查宾语从句。
句意:我不确定谁受到了更大的惊吓,是我还是那只不知从何处突然出现的雌性大猩猩。
根据句意和句子结构可知,空处引导宾语从句,在从句中作主语,表示“谁”,故填who。
二.单项选择1.(2019江苏卷)Scientists have obtained more evidence ___________ plastic is finding its way into the human body.A. whatB. thatC. whichD. where【答案】B【解析】考查同位语从句。
句意:科学家已经获得更多证据,塑料正在进入人们的体内。
从句不缺句子成分,且与evidence指代的是同一事件,用that引导同位语从句。
故选B。
2.(2018江苏卷)By boat is the only way to get here, which is _______ we arrived.A. whereB. whenC. whyD. how【答案】D【解析】考查名词性从句。
考点08名词性从句(核心考点精讲精练)【近年真题考点分布】【思维导图】【知识梳理】➢考点一:宾语从句1.宾语从句的引导词She asked me whether I had returned the books to the library,and I admitted that I hadn't.她问我是否把书还给图书馆了,我承认我还没有还。
Our teacher always tell us to believe in what we do and who we are if we want to succeed.我们的老师总是告诉我们,如果我们想成功的话,就要相信我们所做的事情以及我们自己。
宾语一般放在及物动词或介词之后,但是,在下列情况下,须用it作形式宾语,而将真正的宾语(常为不定式/从句)后置。
(1)动词find/feel/think/consider/make+it+宾补(形容词或名词)+不定式/从句(2)动词hate/ like/ dislike/ appreciate/enjoy+it+从句(3)短语动词see to/ depend on/rely on+it+从句(4)固定搭配take it for granted that/owe it to sb.that+从句No matter where he is,he makes it a rule to go for a walk before breakfast.无论他在哪里,他都定了一个规矩——早餐前散步。
I shall see to it that he is taken good care of when you are absent.你不在的时候,我负责把他照顾好。
I think it necessary that we take plenty of boiled water every day.我认为我们每天多喝白开水是有必要的。
2023届高考英语语法难点讲义:名词性从句考点精析1. that省略问题①只有用在单一的宾语从句才可以省略;②而在并列宾语从句和主语从句、表语从句以及同位语从句都不可以省略。
If we are serious about ensuring (that)our science is both meaningful and reproducible, we must ensure (that)our institutions encourage that kind of science.如果我们真的要确保我们的科学既有意义又可复制,我们就必须确保我们的机构鼓励这种科学。
(动词后只有一个宾语从句,that可以省略)To realize how great was the dramatic activity, we must rememberfurther that hosts of plays have been lost, and that probably there is no authorof note whose entire work has survived.要想认识到戏剧活动的伟大之处,我们必须进一步记住,许多戏剧已经消失,而且可能没有一位著名作者的全部作品留存下来。
(remember后面跟着两个宾语从句,that不可以省略)2. whether& if替换问题只有在宾语从句中,whether可以用if替换,但是下面的几种情况例外:①whether or not搭配(三个词紧跟一起只能用whether,如果or not放结尾依然可以使用if替换);②介词+whether。
③在动词不定式之前只能用whether;④宾语从句放在句首表示强调时,只能用whether;⑤用if引起歧义时,只用whether。
Since our chief business with them is to enable them to share in a common life we cannot help considering whether or not we are forming the powers whichwill secure this ability.由于我们对他们(年轻人)所做的首要工作在于使他们能够在生活中彼此融合,所以我们就禁不住考虑自己是否正在形成一种确保他们获得这种能力的力量。
名词性从句精讲精析——主语从句、宾语从句、表语从句、同位语从句名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句(what,which,who,whose;when,where,how,wh y等),其功能同名词一样。
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 succedor not.It is in the morning that the murder took place.It is John that/who 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…It is obvious that…明显的是…It is important that…重要的是…It is necessary that…必要的是…(3) It is +不及物动词+从句It seems that…似乎…It happened that…碰巧…It appears that…好象/看来…(4) It is+过去分词+从句It is reported that…据报道…It’s said that…据说…It’s believed that…人们相信…It’s hoped that…人们希望…It’s thought that…人们认为…It’s announced that…据宣布…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。
专题02 名词性从句八大考点归纳(讲义)解析版讲义目录考点清单一、that和what典型用法归纳P2 考点清单二、连词if和whether典型用法归纳P3 考点清单三、what和how引导的宾语从句的典型用法P4 考点清单四、wh- ever类从句典型用法归纳P4 考点清单五、两种典型的同位语从句归纳P5 考点清单六、it作形式主语/宾语的名词性从句P6 考点清单七、名词性从句中虚拟语气用法P7 考点清单八、名词性从句中的时态照应P8 分类训练(一)高考真题P10 分类训练(二)模拟试题P11 分类训练(三)单句改错P11 分类训练(四)句式升级(书面表达真题)P12 分类训练(五)外刊原创语法填空P13 (一)二十四节气之大暑来历及风俗 P13(二)传统茶与咖啡混合饮料成为新时尚 P14(三)中国新能源汽车正在进入德国汽车市场P15考点清单一、that和what典型用法归纳要点精讲:①that是连词,只起连接作用,不作句子成分。
②what是连接代词,既起连接作用,又充当句子主语、宾语、定语、表语等。
③特别注意what的替代功能,相当于the thing/time/place/speed that…。
That she lacks experience is obvious. 她缺少经验,这是显然的。
(that引导主语从句,但不作句子成分)My idea is that you shouldn’t have left the country. 我的意见是你不应该离开那个国家。
(that引导表语从句,但不作句子成分)Bob has the mistaken idea that tomorrow is a holiday. 鲍勃错误地认为明天是一个假日。
(that引导同位语从句,但不作句子成分)What he had hoped at last came true. 他希望的事终于成为现实。
(what引导主语从句,且作从句宾语)It was what he meant rather than what he said. 这是他的原意而不是他的原话。
高中英语名词性从句详细讲解一.名词性从句考查的焦点主要有以下六方面1. 考查名词性从句的语序问题2. 考查引导词that与what的区别3. 考查it在名词性从句中作形式主语和形式宾语的用法4. 考查whether与if的区别5. 考查名词性从句中的疑问词+ever引导的名词性从句与no matter+疑问词引导的状语从句的区别6. 考查名词性从句的虚拟语气问题二.名词性从句的含义及连接词名词性从句的含义:在复合句中起名词作用的从句叫做名词性从句。
它包括主语从句、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四类:1. that(无含义,不充当成分)2. whether, if(有“是否”的含义,但不充当成分)3. 连接代词:what, whatever, who, whoever, whom, whomever,whose, which,whichever.(在从句中做主语、宾语、表语和定语)连接副词:when, whenever,where,wherever, how, however,why(在从句中做状语)4. as if,as though,because(不充当成分,在名词性从句中只引导表语从句)三. 四类名词性从句语法要点1.主语从句在整个句子中用作主语的从句叫主语从句。
What he wants to tell us is not clear.他要跟我们说什么,还不清楚。
It is known to us how he became a writer.我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced.英语晚会将在哪里举行,还没有宣布。
it作形式主语: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。
It is clear that he is innocent in the accident.很明显,他在这场事故中是无辜的。
名词性从句在句子中起名词作用的从句叫名词性从句。
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,因此根据它在句中不同的语法功能,名词性从句又可分为主语从句、宾语从句、表语从句、同位语从句。
引导名词性从句的词叫做连接词,包括:1. 连词(在名词性从句中只起连接作用,不作成分)2. 连接代词(在名词性从句中作主语、宾语或表语)3. 连接副词(在名词性从句中作状语)所有的名词性从句的语序都是陈述句语序。
主语从句:是在主句中作主语的从句。
它由连接词引导,通常位于谓语动词之前。
连接词:1. 连词:在从句中不充当任何成分,常见的引导主语从句的连词有that, whether。
That he got the first prize excited him much.他获得一等奖一事使他非常兴奋。
It is doubtful whether we can get there on time.我们能否按时到达那儿还不确定。
1)that引导的主语从句:在从句中不作任何成分,也没有实际意义。
一般情况下that不可省略。
That light travels in straight lines is known to all.众所周知,光沿直线传播。
That you don't like him is none of my business.你不喜欢他不关我的事。
2)whether引导的主语从句:常置于句首,表示“是否”之意;if一般不引导主语从句。
Whether he can finish his task on time is of greatimportance.他是否能按时完成任务非常重要。
Whether you can succeed or not depends on how hard you work at it.你能否成功取决于你努力的程度。
连接代词:在从句中起名词或代词的作用,常作从句的主语、宾语、表语或定语,有具体意义且不能省略。
复合句一. 名词性从句:1.名词性从句主要分为四大类:主语从句、宾语从句、表语从句和同位语从句。
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。
2.名词性从句的语序:名词性从句在句中要用陈述句语序。
如:He asked me what was the matter with me.We’ve heard the news that we’ll move into the new house.Whatever you say will interest us all.(一)主语从句1.定义: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。
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:由that引导的从句,通常用形式主语来代替。
That he has disappeared worries his parents.It worries his parents that he has disappeared.It is not likely that he can win the lottery.It is a big surprise that he is still alive.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。
Whether or not she will go to Japan is up to her.Whether he will take part in the play is not clear.3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever由what等代词引导的从句,表示”所1的(东西)”,实际上等于一个现行词加上一个定语从句,也可以由-ever等代词引导。
名词性从句全面讲解名词性从句是英语中的一种从属从句,它在句中充当名词的功能。
名词性从句可以在句子中作主语、宾语、表语和同位语等,并且可以由不同的引导词引导。
本文将全面讲解名词性从句的基本概念、用法及常见的引导词。
一、名词性从句的概念名词性从句是由一个词或一个词组引导的从句,它在句子中充当名词的角色。
名词性从句通常出现在复杂的句子中,起到连接主句和从句的作用。
名词性从句的引导词有很多种类,常见的有:that, whether, if, what, which, who, whom, whose, when, where, why等。
二、名词性从句的用法名词性从句可以在句子中作不同的成分,下面分别介绍其主要用法。
1. 名词性从句作主语名词性从句可以作为主语来引导句子,常用的引导词有:- That: That he is innocent surprises me.(他是无辜的让我吃惊。
)- Whether/If: Whether he will come or not is uncertain.(他是否会来还不确定。
)- What: What you said is true.(你说的是真的。
)2. 名词性从句作宾语名词性从句可以作为宾语来引导句子,常用的引导词有:- That: I know that he is a doctor.(我知道他是个医生。
)- Whether/If: I wonder whether/if it will rain tomorrow.(我想知道明天是否会下雨。
)- What: I don't understand what he is saying.(我不明白他在说什么。
)3. 名词性从句作表语名词性从句可以作为表语来引导句子,常用的引导词有:- That: The truth is that she is not happy.(事实是她不幸福。
)- Whether/If: The question is whether/if we should go or not.(问题是我们是否应该去。
适用文档名词性从句解说在复合句中起名作用的从句叫做名性从句。
它包含主从句、从句、表从句和同位从句。
名性从句是中学段的一个重要法目,在年的高考取几乎都波及到,而且每年的命各有化。
解析届高考名性从句考的焦点主要有以下六个方面1.考名性从句的序2.考引 that与 what 的区3.考 it 在名性从句中作形式主或形式的用法4.考 whether 与 if 的区5.考名性从句中的疑+ever 引的名性从句与no matter+ 疑引的状从句的区6.考名性从句的虚气法重点解析一、名性从句主从句、表从句、从句、同位从句,在整个句子中所起的作用,相当于一个名。
所以,四种从句通称名性从句。
引名性从句的接可分三:接: that, whether, if(不充任从句的任何成分)接代: what, whatever, who, whoever, whom, whose, which.接副: when, where, how, why1.主从句作句子主的从句叫主从句。
主从句往常由附属that ,whether ,if和接代what ,who,which ,whatever , whoever 以及接副 how, when, where, why 等引。
that 在句中无,只起接作用;接代和接副在句中既保存自己的疑含、又起接作用,在从句中充任从句的成分。
比如:What he wants to tell us is not clear.他要跟我什么,不清楚。
It is known to us how he became a writer.我都知道他是如何成一名作家的。
Where the English evening will be held has not yet been announced.英晚会将在哪里行,没有宣告。
有防止句子重脚,常用形式主it取代主从句作形式主放于句首,而把主从句置于句末。
主从句后的一般用数形式。
名词性从句综合典型例题讲解从句是语法学家和教师说来都相当重要的一类语句,尤其是名词性从句(Noun Clause)在英语句子结构中具有重要作用,为了使读者更好地理解,本文主要就典型的名词性从句例题进行讲解。
1. 什么是名词性从句首先,我们必须弄清楚什么是名词性从句,它是一种可以独立使用的句子从句,它可以像名词一样在句子中作主语、宾语和它句等,但它必须由引导词和从句来表达意思,并且它们可以替代单一的名词成分,比如:That he will come tomorrow is certain.在以上句子中,That he will come tomorrow一个名词性从句,它可以替换名词certain来表达意思。
2.词性从句的常见引导词当出现名词性从句时,引导词总是先出现,它是由连词、疑问词和关系副词等组成的,如:what、that、when、why、whether、who、which、how等。
3.词性从句的示例通过上面的讲解,我们已经可以正确地识别出名词性从句,接下来将提供几个典型例题供大家参考:(1) What happened on the playground shocked the teachers.这是一个把what作为主语的名词性从句,其中what作为引导词,happened on the playground作为从句,本句的意思是“在操场上发生的事惊动了老师”。
(2) Who is coming to the party is still unknown.这是一个把who作为主语的名词性从句,其中who作为引导词,is coming to the party作为从句,本句的意思是“来参加派对的人还不清楚”。
(3) How to solve the problem has been puzzling them.这是一个把how作为主语的名词性从句,其中how作为引导词,solve the problem作为从句,本句的意思是“如何解决这个问题一直困扰着他们”。
名词性从句——主语从句、宾语从句、表语从句、同位语从句名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句,其功能同名词一样。
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 he 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, as hamed, 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, suppose, 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,同时可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)名词性从句精讲精析(2)名词性从句精讲精析(2)——由连接词引导的名词性从句一、引导名词性从句的连接词引导名词性从句的连接词可分为三类:连接词:that,whether,if (不充当从句的任何成分)连接代词:what, whatever, who, whoever, whom,whose, which.连接副词:when, where, how, why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。