名词性从句精讲
语法精讲03-名词性从句
三、名词性从句(一)名词能做什么成分?1.The movie looks attractive.主语2.I appreciate his mother.宾语3.Gump is a man.表语4.I enjoy the part,the end.同位语(同样位置的语。
作文中只要见到名词,都可以在他后面再加一个名词,作为他的同位语。
)Teamwork ,a Chinese conventional virtue ,plays a crucial role on the road to glories.(二)什么是名词性从句?1.什么是从句:引导词加主语加谓语2.什么是名词性从句:名词在句子中能够充当什么成分,从句在句子中也能充当什么成分,这就是名词性从句。
名词性从句一共包括四类:主语从句,宾语从句,表语从古和同位语从句1)What I saw is attractive.2)I appreciate what she said.3)Gump is who we should learn from.4)I enjoy the part that a feather is flying in the sky.(三)名词性从句的引导词1.That He has got divorced is my fault.2.Whether he Has got divorced is obvious.3.Who he will marry is a secret.名词性从句的引导词是按照从句的类型分的类,一共将引导词分成三类:1.That:当从句是陈述句时。
并且that在从句中没有意思也不充当任何成分,不可去掉2.Whether:当从句是一般疑问句时。
Whether在从句中依然不充当任何成分,但是意思可以翻译成“是否”。
3.所有的特殊疑问词:当从句是特殊疑问句时。
所有引导词在句子中都充当了本来充当的成分,并他具有确定的的意思,并且英语中所有的从句都应该是陈述句的形式,也就是引导词加主语加谓语的形式。
名词性从句讲解(最全版)
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。
名词性从句解读
名词性从句解读名词性从句是英语语法中的一种重要结构,它在句子中担任名词的作用。
在本文中,我们将探讨名词性从句的概念、分类以及使用方法,帮助读者更好地理解和运用名词性从句。
一、名词性从句的概念名词性从句,顾名思义,是指在句子中可以担任名词功能的从句。
它与名词一样,可以在句子中作主语、宾语、表语、同位语等。
名词性从句主要有三种类型: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作主语,常由连接词“that”引导。
例如:- That he is late makes me angry.(他迟到了让我生气。
)- Whether she can come is still uncertain.(她能否来还不确定。
)2. 宾语从句宾语从句在句子中作及物动词的宾语,常由引导词“that”或“whether/if”引导。
例如:- He asked whether/if I could help him.(他问我能否帮他。
)- I believe that he will succeed.(我相信他会成功。
)3. 表语从句表语从句在句子中作表语,常由引导词“that”或“whether/if”引导。
例如:- The problem is that we don't have enough time.(问题在于我们没有足够的时间。
)- My concern is whether/if he understands the importance of this project.(我的担忧是他是否理解这个项目的重要性。
)二、名词性从句的使用方法名词性从句可以使句子更加丰富、灵活,同时也能够避免重复使用某些词语。
以下是使用名词性从句的一些常见方法:1. 引导词的选择名词性从句的引导词有很多,如“that”、“whether/if”、“what”、“who”、“why”等。
在选择引导词时,需要根据具体语境和从句的功能来确定。
高中名词性从句语法精讲详解
高中名词性从句语法详解名词性从句:宾主同表(宾从,主从,同从,表从)一、宾语从句宾语从句的类型(1)主语+谓语+宾语从句He said that he wouldn’t take part in the sports meeting.(2)主语+be+adj+宾语从句I’m sure that our team will win.☆只限于少数adj. sure, certain, afraid, confident, etc(3)主语+谓语+宾(表)语+介词+宾语从句(except, in that在于,因为)He is a good student except that he is a little careless.I like the city,but I like the country better in that I have more friends there1. 宾语从句的连接词1)连词that,只起连接作用,在从句中不作句子成分,也无词汇意义,在口语中常被省略★由that 引导的宾语从句在以下情况下不能省略:(1).在主+谓+it(形式宾语)+宾补+that从句(真正宾语) 的句型中:表喜欢、憎恶等心理活动的动词或词组后习惯上先跟形宾it:hate, love, enjoy, dislike, don’t mind, feel like, appreciate, rely/depend on, count on, see to, take, owe等We must make it clear that we mean what we say.We heard it that she would get married next month.(2).由and连接的两个由that引导的宾语从句中,第二个that 不省略.He told me (that) he would come and that he would come on time. (3) 从句前有插入语:He may tell you, for example, that she is interested in Chinese(4)从句主语是that时:He says that that is a useful book(5)当that从句是双宾语中的直接宾语时,that不可省。
高考重难点名词性从句精讲
词、不定式等非谓语动词的宾语)
在主+谓+it(形式宾语)+宾补+that从句(真正 宾语) 的句型中不省略
We must make it clear that we mean what we say. 由连词and连接的两个由that引导 的宾语从句中,第二个that 不省略.
表语从句:在句中充当表语成分,一般放在连系动词
之后. 作用:对主语进行解释说明。
3. 表语从句:
在连系动词之后的句子叫做表语从句。
例:问题是谁能去那里。 表语 The question was who could go there. 例:那是他为什么迟到的原因。 That is why he was late. 表语
主语
例:他住在哪里我们都不知道。
Where he lives is unknown to us.
主语
例:不太清楚她为什么迟到。 Why she was late is unclear.
主语
例:这本书怎么销售取决于它的作者。
How the book will be sold depends on its writer .
{I don’t like what he does every day. {
I don’t know about the man, Mr. White. I don’t know that he is a teacher.
I don’t like his job.
2.宾语从句:(object clause) 用作宾语的从句叫做宾语从句。一般放在及物动词,介
名词性从句
1.主语从句
*名词性从句的特点是
名词性从句解析
名词性从句解析名词性从句是英语中一种重要的从句结构,它在句子中充当名词的成分。
名词性从句可以作为主语、宾语、表语和同位语,它的引导词包括连接代词和连接副词。
名词性从句可以帮助我们丰富句子结构,增强表达的准确性和多样性。
接下来,本文将对名词性从句进行详细解析,并给出一些例子来说明其用法。
一、名词性从句作主语名词性从句作主语时,常用的引导词有:that、whether、if、what、who、which等。
以下是几个例子:1. That he is innocent is beyond doubt.(他无辜是毫无疑问的。
)2. Whether he will come to the party is still uncertain.(他是否会来参加派对还不确定。
)3. If she can finish the work on time remains to be seen.(她能否按时完成工作还有待观察。
)4. What you said doesn't make any sense.(你说的话没有任何意义。
)5. Who will be the next president is under discussion.(谁将成为下一任总统正在讨论中。
)二、名词性从句作宾语名词性从句作宾语时,常用的引导词有:that、whether、if、what、who、which等。
以下是几个例子:1. He knows that I am telling the truth.(他知道我说的是真话。
)2. I'm not sure whether it will rain tomorrow.(我不确定明天是否会下雨。
)3. I wonder if he has received my email.(我想知道他是否收到了我的电子邮件。
)4. Please tell me what you want for dinner.(请告诉我你想要吃什么晚餐。
高中英语语法-名词性从句精讲(共73张PPT)
Whoever wants the book may have it. I’ll do whatever I can to help him. Buy whichever is cheapest.
连接副词 when, where, how, why
when • When they will start is unknown yet. where • Where she has gone is a mystery. how • How this happened is not clear. why • Why he did that wasn’t quite unclear.
主语从句关联词 连词 that, whether 连接代词 what, who, whom, which 连接副词 when, where, how, why
连词 that, whether
只起连接作用 在从句中不充当任何句子成分
• That he will win is certain.
• It has been reported that sales of beef in China will increase.
宾语从句关联词 连词 that, whether; if 连接代词 what, who, whom, whose, which 连接副词 when, where, how, why
• I doubt _______ he will come soon. • I do not doubt _____ he will come soon. • Do you doubt _____ he will come soon?
• what surprised me was what he said.
英语名词性从句重难点精讲
▲注意辨别it作形式主语与it引导的强调句型的差异。如果把句中的it is/ was ... that/ who ...去掉,剩余部分仍能组成一个意义和结构均完整的句子,则原句是强调句型。
It was last summer that he graduated from the college.(→He graduated from the college last summer.) (强调句型)
It is strange that he didn’t come to school.
▲需要注意的是,当 what作“……的东西”讲引导主语从句时,一般不用it作形式主语。whatever, whoever, whichever引导的主语从句一般不用it作形式主语。
(×)It is more experience what he needs. ( 应说:What he needs is more experience.)
▲what指无限定范围的选择。若已限定了范围,则应用which。
That is what he chose.
Which team has won the game is not known yet.
▲what (ever),whoever, whichever 等是双重关系代词,它既起先行词的作用,又起关系代词的作用,此时不可在这些词前加that, all或在这些词后再加关系代词。
(×)All what she said is true. (可说All that she said is true. 或 What she said is true)
(×) Whatever that is worth doing should be done well. (应去掉that)
名词性从句精讲
名词性从句专题在一个句子中,名词能作主语、宾语、表语和同位语。
当我们在一个句子中用一个句子来担当主语、宾语、表语和同位语时,这个句子就叫做主语从句、或宾语从句、或表语从句、或同位语从句。
这些从句的统称为名词性从句。
名词性从句的功能相当于名词词组。
所以按其句法功能,名词性从句可分为主语从句、表语从句、宾语从句和同位语从句。
引导名词性从句的有连接词that, whether 和if,关系代词who, whom, whose, what, which, whatever, whichever, whoever以及关系副词when, where和how。
任何一种从句都必须由一个引导词来引导。
引导名词性从句的引导词在语法上称为连接词。
而连接词又根据它们在句子中的不同作用又被划分为:连接词连接代词连接副词. 一、名词性从句的引导词有:连接词:that、if、whether连接代词:who/ whom/whose/what/which/wh_ever连接副词:when/where/why/how/二、各种连接词的用法:1.连接词that、whether、if 不在它们引导的主语从句中充当句子成分。
2. 连接代词who、whose、what、which等都在句子中担当一个句子成分。
比如:主语、宾语、表语、定语等等。
3. 关系副词when、where、how、why等分别在句子中作时间状语、地点状语、方式状语等等。
主语从句(The Subject Clause)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和连接代词what,who,which,whatever,whoever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;连接代词在从句中起名词的作用,在句中既保留自己的疑问含义、又起连接作用,作主语、宾语、表语、定语等;连接副词在从句中起副词的作用,作状语。
名词性从句讲解(最全版)
_w__h_e_t_her the old man will recover soon.
名词性从句引导词的用法(2):
“who”---“谁”、作主语、起连接作用
“whom”---“谁”、作宾语、起连接作用
连接代词
(同位语)
1、主语从句 ( subject clause )
分类
2、表语从句 ( predicative clause ) 3、宾语从句 ( object clause )
4、同位语从句 ( appositive clause )
引导词
从属连词(3个):that 、if、 whether
连接代词 (9个):who、 whom 、 what、 which、 whose、 whoever whomever、 whatever、 whichever、
disease .
(表语从句)
3、He asked us when we would graduate from the
school .
(宾语从句)
“where”-- “什么地方”、作状语、起连接作用
1、Where I could buy the book is uncertain now .
(主语从句)
hand .
(表语从句)
3、I want to know whose suggestion is more
practical .
(宾语从句)
名词性从句引导词的用法(3):
连接代词
“whoever”-- “-----的任何人”、作主语、 “whomever”-- “-----的任何人”、作宾语、 “whatever”-- “----的任何东西”、作主表宾语、 “whichever”--- “无论哪个或哪些---”、作定语、
(完整版)高中英语名词性从句详细讲解
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。
名词性从句的用法与例句解析
名词性从句的用法与例句解析名词性从句是指在句子中作为名词使用的从句。
它可以充当主语、宾语、表语或同位语,起到连接主句与从句的作用。
名词性从句在英语中使用广泛,掌握好名词性从句的用法可以提高英语写作和口语表达的水平。
本文将介绍名词性从句的几种常见用法,并给出相应的例句解析。
一、名词性从句作主语名词性从句可以作为句子的主语,代替一个单词或一个名词短语。
常见的名词性从句作主语的句型有:1. It + be + 名词性从句例如:It is important that we protect the environment.(保护环境是重要的。
)解析:名词性从句“that we protect the environment”作为主语,其中“that”引导从句,描述了主观认识的重要性。
2. 名词性从句 + 动词例如:What he said is true.(他说的是真的。
)解析:名词性从句“What he said”作为主语,其中“What”引导从句,表示“他所说的”。
二、名词性从句作宾语名词性从句可以作为句子的宾语,接受动作的影响。
常见的名词性从句作宾语的句型有:1. 动词 + 名词性从句例如:I believe that he can succeed.(我相信他能够成功。
)解析:名词性从句“that he can succeed”作为宾语,其中“That”引导从句,表示对“他能够成功”这一事实的信任。
2. 名词 + 不定式 / 动名词 + 名词性从句例如:She has no idea what to do next.(她不知道接下来该做什么。
)解析:名词性从句“what to do next”作为宾语,其中“What”引导从句,表示对接下来该做什么的不确定性。
三、名词性从句作表语名词性从句可以作为句子的表语,说明主语的性质或状态。
常见的名词性从句作表语的句型有:1. 主语 + be + 名词性从句例如:The problem is that we don't have enough time.(问题在于我们没有足够的时间。
名词性从句全面讲解
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。
名词性从句精讲
名词性从句精讲一、概述:起名词作用的从句叫名词性从句。
它和名词一样,在句中可充当主语,表语,宾语和同位语。
名词从句包括主语从句,表语从句,宾语从句和同位语从句。
名词性从句中的连接词有连词that / whether / as if,连接代词what / who/ which / whose / whatever / whoever / whomever / whichever,连接副词where / when / why / how / wherever / whenever。
(1)that的用法。
①主语从句、表语从句、同位语从句中用that但不能省略。
如:That they are good at English is known to us all.The problem is that we don’t have enough money.She expressed the hope that they would come to China one day.②宾语从句中的连接词that有时可省有时又不可省,在以下几种情况中that不能省略:(A)当that从句和主句谓语动词之间有插入词语或者从句主语之间有插入语时,that不可省略;(B)当that 从句与另一名词性从句并列作宾语时,that不能省,否则成带并列句了的从句了(一般是and连接)(C)当that作介词宾语时,that不可省掉。
(D)如果宾语从句本身含有主从复合句时,that一般不宜省。
(E)当主、从句之间有时间等状语修饰时,that不宜省略,否则会产生歧义。
(F)宾语从句提前时,that不宜省略。
(G)简单回答中的宾语从句,that不宜省略。
(H)当it作形式宾语代替that引导的宾语从句时,一般保留that为好。
Everyone knew what happened and that she was worried.The reason lies in that she works harder than the others do.③that从句作主语和宾语时,可以用it 来替换成以下几种结构表达。
高考英语语法一轮复习——名词性从句精讲及练习(附答案)
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。
一.主语从句主语从句是在主句中作主语的句子,它由连接词引导,通常位于谓语动词之前。
1. 连词:在从句中不充当任何成分,常用见的引导主语从句的连词有三个,即that, whether和if.That he got the first prize excited him much. 他获得一等奖一事使他非常兴奋。
Whether you can succeed or not depends on how hard you work at it. 你能否功取决于你努力的程度。
注意:whether引导的主语从句常用置于句首,表示“是否”之意;if引导主语从句时不置于句首。
2. 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。
常见的连接代词有who, whom, whose, what, which, whoever, whomever, whatever, whichever.What we should do with the problem is undecided. 我们如何处理这上问题还未作出决定。
3. 连接副词:在从句中起副的作用,常作从句的状语,表示时间、地点、原因、方式等。
常见的连接副词有when, where, how, why, whenever, wherever, however等。
How they will solve the serious problem has not been decided. 他们将如何解决这个严重的问题还没有决定。
Why he did that wasn’t quite clear. 他为什么做那件事还不十分清楚。
(完整版)高中英语名词性从句讲解
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。
英语 名词性从句精华版
1. 主语从句:从句在句中充当主语成分
1). That he will succeed is certain . 2) Whether he will go there is not known . 3) What he said is not true . 4) Where he hid the money is to be found out . 5) Whoever comes is welcome. 6) It’s certain that he will succeed . 7) How we can help the twins will be discussed at the meeting. 8)When they’ll start the project has not been decided yet.
3. 表语从句:从句在句中充当表语成分,一般放在连 系动词之后. 作用:对主语进行解释说明。
连接词:that / whether /as if /as though/because ( if 不引导 表语从句) 连接代词:who / whom / whose / which / what 连接副词:when / where / why / how / because
名词性从句 精讲
主语从句 宾语从句 表语从句 同位语从句 从句一律保持陈述语序。
名词性从句可以表示:事实和问题。
1.连接词有: that whether 和 lf 2.连接代词有:who whom whose which what 等 3.连接副词有:when where why how 等 另外 whatever whoever whichever等 也可 以引导主语和宾语两种从句。
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名词性从句2009-03-12 00:12一、引导名词性从句的连接词1. 连接代词:who, whose, whom, what, which。
有词义,在从句中担任成分,如主语、表语、宾语、或定语等。
2. 连接副词:when, where, why, how。
有词义,在从句中担任成分,作状语。
3. 连接词:that, whether, if, as if。
that 无词义,在从句中不担任成分,有时可省略;if (whether), as if虽有词义,但在从句中不担任成分。
注意:连接代词与连接副词在句中不再是疑问句,因而从句中谓语不用疑问式。
连接代词与连接副词在从句充当句子成分,连接词whether 和if(是否),as if(好像)在从句中不充当句子成分,只起连接作用。
根据句义,如果连接代词与连接副词,whether、if 和as if都用不上时,才用that作连接词(that本身无任何含义)。
二、主语从句1. 主语从句在复合句作主语。
e.g. Who will go is not important.2. 用it作形式主语,主语从句放在句末。
e.g. It doesn’t matter so much whether you will come or not.3. that引导主语从句时,不能省略。
e.g. That he suddenly fell ill last week made us surprised.三、表语从句1. 表语从句在复合句中作表语,位于系动词之后。
e.g. The question was who could go there.2. 引导表语从句的连接词that有时可省去。
e.g. My idea is (that) we can get more comrades to help in the work.四、宾语从句1. 宾语从句在复合句中作宾语。
引导宾语从句的连词that一般可省略。
e.g. I hope (that) everything is all right.2. 介词之后的宾语从句,不可用which或if连接,要分别用what或whether。
e.g. I'm interested in whether you've finished the work..I'm interested in what you've said.3. whether与if都可以引导宾语从句,常可互换。
但下面情况不能互换。
(1)宾语从句是否定句时,只用if,不用whether。
e.g. I wonder if it doesn't rain.(2)用if 会引起误解,就要用whether。
e.g. Please let me know whether you want to go.(此句如果把whether改成if,容易当成条件句理解)(3)宾语从句中的whether 与or not直接连用,就不能换成if;不直接连用,可换。
e.g. I don't know whether or not the report is true.I don't know whether/ if the report is true or not.(4)介词后的宾语从句要用whether引导。
whether 可与不定式连用。
whether 也可引导主语从句、表语从句、同位语从句,还可引导让步状语从句,以上均不能换成if。
但引导条件从句时,只能用if,而不能用whether。
e.g. It depends on whether we have enough time.They don't know whether to go there.Please come to see me if you have time.五、同位语从句同位语从句在句中作某一名词的同位语,一般位于该名词(如:news, fact, idea, suggestion, promise等)之后,说明该名词的具体内容。
e.g. I have no idea when he will be back.The fact that he had not said anything surprised everybody.名词性从句与高考试题名词性从句的界定与分类:名词性从句相当于名词,可分别作主句中的主语、表语、宾语和同位语。
因此,名词性从句可分为主语从句、表语从句、宾语从句和同位语从句。
从属连词that, if, whether;连接代词who, whoever, whom, whomever, which, whichever, what, whatever, whose;连接副词where, when, why, how。
其中, 从属连词只起连接作用, 在从句中不充当任何句法成分,而连接代词和连接副词既起连接作用, 在从句中又充当一定的成分.名词性从句均不能用逗号和主句分开。
一、主语从句:定义:一个从句在复合句中作主句的主语,这个从句就叫主语从句。
二、主语从句的表现形式:1。
由从属连词引导的主语从句:a. Whether the country should build a nuclear power station is something we mustdiscuss.b. That light travels in straight line is known to all .2。
由连接代词引导的主语从句:a. What we need is more time.b. Whichever book you choose doesn’t matter to me.c. Whoever comes will be welcome.3。
由连接副词引导的主语从句:a. When the plane is to take off hasn’t been announced .b. Where he has been is still a puzzle.c. How much water is flowing can be measured easily.三、关于形式主语it主语从句放在句首往往显得头重脚轻,不太平衡,因此,在大多数情况下都是在主语的位置上用一个形式主语it,而把主语从句移到句未去。
关于形式主语it: 以it 作形式主语,把主语从句后置的常用句型有:(1)It + be + 形容词+ that从句It is quite clear that Tom was fond of music.(2)It + be + 名词+ that从句It is a pity that she has made such a foolish mistake.可应用于此句型的名词还有fact / shame / honor / question等。
(3)It + be + 过去分词+ that从句It’s not yet decided that when the test will be given.(4)It seems, happens 等不及物动词+ that从句It happened that I didn’t take any money with me.但以下情况往往必须用it作形式主语,主语从句一般不能放在句首。
a. It doesn’t mat ter whether he likes or not.b. It’s said that the highway will be open to traffic next year.c. Is it likely that it will snow in the afternoon?练习:1.____ fashion differs from country to country may reflect a cultural difference from one aspect.(2002春季上海)A.What B.That C.This D.Which2.____ she couldn't understand was _____fewer and fewer students showed interests in her lessons.(2000上海)A.What;why B.That;what C.What;because D.Why;that3.____has helped to save the drowning girl is worth praising.(99上海)A.Who B.The one C.Anyone D.Whoever4.____ we can't get seems better than ____ we have.(NMET96)A.What;what B.What;that C.That;that D.That;what5.____ we'll go camping tomorrow depends on the weather.(NMET96)A.If B.Whether C.That D.Where6.____ he said at the meeting astonished everybody present.(MET93)A.What B.That C.The fact D.The matter7.____ you don't like him is none of my business.(92上海)A.What B.Who C.That D.Whether二, 表语从句:定义:一个从句在复合句中作主句的表语,这个从句就叫作表语从句。
可以接表语从句的连系动词有be, look, remain, seem 等。
1.The problem is that millions of people die of illnesses caused by smoking.2.The question remains whether we can win the people.3.That’s just what I want.4.This is where our problem lies.5.The difficulty is how I can help smokers kick their habit.值提注意的是:1. 表语从句的表现形式除了用从属连词,连接代词和连接副词引导以外,还可以由as, as if a s though引导.Things were not as they seemed.It looks as if it is going to rain.2、另外还要注意以下常用的两种结构:The reason why…is that … (而不用because。