名词性从句_语法讲解
高中语法讲解—名词性从句
名词性从句1.从句的分类状语从句（分9种）从句主语从句名词性从句宾语从句表语从句同位语从句2.说明：①名词性从句的功能相当于名词，根据其在句中充当的成份，有不同的叫法。
②引导名词性从句的词语主要有：a.从属连词that，无词义，不作句子成分；b.从属连词if，whether（是否）有词义，但不作句子成分；c.从属连词as if（=as though，似乎、好像）有词义，但不作句子成分；d.连接代词who，whoever，what，whatever，whom，whomever，which，whichever，how much，how many有词义，作成分；e.连接副词when，whenever，where，wherever，why，how，however，how often，how soon，how far，how long作句子成分。
③在名词性从句中，要用陈述语序。
【例】1.I don’t kno w where does he live.(false)I don’t know where he lives.(true) 我不知道他住在哪。
2.What life in the future will be like is unknown.(true)What will life in the future be is unknown.(false)④不可用no matter who，no matter what等引导名词性从句，只能引导状语从句。
一、主语从句1.定义：若处在主语的位置上是个句子，那么这个句子就叫做主语从句。
2.注意事项：a.在主语从句中，任何引导词都不可以省去。
【例】That her hair is turning grey worries her.b.在主语从句中，不用if，用whether。
【例】Whether he will come or not is not clear.(true)If he will or not is not clear.(false)c.主语从句作主语时，谓语动词用单数。
语法解析名词性从句
语法解析名词性从句一、概念说明名词性从句是从句的一种，它在句中的地位和作用相当于名词。
名词性从句可以充当主语、宾语、表语或同位语。
二、主语从句主语从句用来充当整个句子的主语。
示例：1. What she said is true.（主语从句作主语）2. Whether he will come is uncertain.（主语从句作主语）3. If it rains, we will stay at home.（主语从句作主语）三、宾语从句宾语从句用来充当及物动词或介词后面的宾语。
示例：1. She asked me what my name was.（宾语从句作宾语）2. I wonder if he is coming.（宾语从句作宾语）3. He told me where he lived.（宾语从句作宾语）四、表语从句表语从句用来充当系动词后面的表语。
示例：1. The important thing is that we keep trying.（表语从句作表语）2. His wish is that everyone be happy.（表语从句作表语）3. Her dream is to become a famous singer.（表语从句作表语）五、同位语从句同位语从句用来解释或说明名词的具体内容。
示例：1. The fact that he didn't study resulted in a poor grade.（同位语从句解释the fact）2. My understanding is that we need to work together.（同位语从句解释my understanding）3. The idea that she suggested is worth considering.（同位语从句解释the idea）六、关系代词引导的名词性从句关系代词引导的名词性从句在从句中充当成分的同时，引导词也在主句中充当成分。
名词性从句_语法讲解
单个的主语从句作主语时，谓 语动词用单数形式。如果是两 个或两个以上的主语从句作主 语，谓语动词则用复数形式。 Where and when he was born has not been found. When the person was murdered and why he was murdered are still unknown.
I
名词性从句的种类
• 1.When we will start is not clear.
主语从句
• 2.Mrs Black won’t believe that her son has become a thief. 宾语从句
• 3. My idea is that we should do it right now. 表语从句 • 4.I had no idea that you were her friend.
宾语从句
在复合句中作主句的宾语,放在实义动词或介词的后 面.引导词有连词that (that 常可省略),whether, if; 代词有who, whose, what ,which; 副词有when ,where, how, why 等.如:
We believe (that) he is honest.
(4)用if不用whether的情况:
意:在主语从句中用来表示惊奇、不 相信、惋惜、理应如此等语气时，谓 语动词要用虚拟语气 “ should +do”， 常用的句型有：
It is necessary \ essential that…. It’s important that…. It’s natural that…. It's strange that …
同位语从句
英语语法与词汇详解 名词性从句
英语语法与词汇详解名词性从句一、什么是名词性从句？①在句子中起名词作用的句子叫名词性从句。
②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。
③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。
二、主语从句①作句子主语的从句叫主语从句。
②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。
③that在句中无词义，只起连接作用，但不可省略④连接代词和连接副词在句中既保留自己的疑问含义，又起连接作用，在从句中充当从句的成分。
⑤例句：->What he wants to tell us is not clear．[他要跟我们说什么还不清楚。
]->Who will win the match is still unknown．[谁能赢得这场比赛还不得而知。
]->It is known to us how he became a writer.[我们都知道他是如何成为一名作家的。
]->Where the English evening will be held has not yet been announced.[英语晚会将在哪里举行，还没有宣布。
]为避免句子头重脚轻，常用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。
常用句型有：->It+be+名词+that从句->It+be+形容词+that从句->It+be+动词的过去分词+that从句->It+不及物动词+that从句三、宾语从句①用作宾语的从句叫宾语从句。
②引导宾语从句的关联词与引导主语从句和表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。
③由连接词that引导宾语从句时，that在句中不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时，第二个分句前的that不可省。
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.
英语名词性从句讲解【完整版】
2、I asked him if he could do me a favor .
If与whether的区别：
1、If不能引导放于句首的主语从句，而whether可以。 2、引导表语从句用whether，不用if。 3、引导同位语从句用whether，不用if。 4、whether可以引导从句作介词的宾语，不用if 。 5、whether or not 连在一起可以，但if不可以。而 “whether-----or not = if -----or not”
同位语从句：
定义：在复合句中充当同位语的句子。 同位语从句用来对其前面的抽象名词进行解释说明，被解释说明的词和 同位语在逻辑上是主表关系。 同位语常见名词：fact, suggestion, advice, idea, decision, news, thought, hope, belief, truth, doubt, promise, possibility, truth, warning, message, reason, report, question，explanation, wish, problem等。 常见的连接词：that, whether, what, who, how, when, where等。 用法： The thought that I want to buy my mother a birthday gift makes me excited.that 引导的同位语从句，解释说明 thought，从句不缺成 分 There is some doubt whether he will come. whether 引导同位语从句，if 不能引导同位语从句 we haven’t made the decision where we are going to spend our vacation. 有时同位语从句可以不紧跟解释说明的名词后面。 The news is surprising that he won the match.
英语语法基础-第7讲(名词性从句)
请比较下面两种句型：
复合宾语的一般句型：主语 + 谓语 + 宾语 + 宾语补足语
宾语从句后置的句型：主语 + 谓语 + 形式宾 语it + 宾语补足 find this book very useful.
➢ I find it very useful that you read aloud when
B. 在一些具有建议、命令等意义的形容词后的主
语从句中，谓语用虚拟语气“should + 动词 原形”，should可以省略，谓语动词用原形。
这类形容词主要有：
■appropriate 适当的 ■essential 必需的
■imperative 必要的
■important 重要的
■impossible 不可能的
Where we will spend our holiday has not been decided.
Why he did that is a mystery.
❖ 在所有的从句中，不用疑问句的语序，即使是由疑问代词 或疑问副词引导的从句，也必须用陈述句语序。请比较下 面的例句：
What did you do yesterday?
引语多用于文字，通常要用引号括起来，与句子的其他部分分
离。间接引语多数情况下就是一个宾语从句。
例：
直接引语：
He said: “I am going to see a film this afternoon.”
you study English .
注：it 是形式宾语，真正的宾语是that 从句。
16
3、直接引语和间接引语
❖
我们在引用别人说的话时，通常有两种办法：
语法讲解_名词性从句
名词性从句名词性从句包括主语从句、宾语从句、表语从句和同谓语从句。
一、连接词连接代词：that, what, who，which, whom，whose, whatever, whoever, whichever等连接副词：whether, how, why, when ,where, wherever等二、连接代词（除that外）和连接副词在名词性从句中都有词义，它们除了引导名词性从句外，还在从句中充当成分，即做主语、宾语、表语、定语和状语。
Who will go there is not important.Where she has gone hasn’t been known yet.I don’t know what I should do.He asked whose dictionary it was.Please tell me when we shall discuss our work plan.I have no idea how soon they are coming.要注意以下几点问题：1、连接代词‘that’的用法：在名词性从句中that 无词义，在从句中不充当任何句子成分，只起连接从句的作用，在宾语从句中，that在口语中可以省略。
但在引导主语从句时不能省略。
That he was chosen made us very happy.We heard the news that our team had won.The truth is that he is the best in his class.He said (that) he would see me the next week.2、引导宾语从句的that可省略，但及物动词后有两个宾语时，可省略第一个that, 不省略第二个that；如有形式宾语时，连接真正宾语的that 不能省略。
They made it a rule that they got up at six every day.3、由连词that引导的名词从句很少做介词的宾语，只在except, but , besides介词后看到，其他一些介词的宾语从句如果由连词that 引导，需用it作形式宾语。
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now.
表语从句
• 4.I had no idea that you were her friend.
同位语从句
什么是名词性从句?
在英语的句子结构中，本来该由名词充当的主语、宾 语、表语和同位语，由一个句子来充当,这个句子就叫 名词性从句。
主语从句 ( The Subject Clause)
名
词 宾语从句 ( The Object Clause) 性
I 名词性从句的种类
• 1.When we will start is not clear.
主语从句
• 2.Mrs Black won’t believe that her son has
become a thief.
宾语从句
• 3. My idea is that we should do it right
错误 That he will not come to the meeting this evening is true.
3).whether可以引导主语从句 解释为”是否”,但if不能.
4).whoever, whatever, whichever等词可以引导主 语从句, 但no matter who, no matter what 等不能, 它们只能引导让步状语从句.
2).连接代词: who, whom, whose, what, which, whoever, whatever, whichever
Whose bag is it ?
It can`t be told. Whose bag it 来自s can`t be told.
It can`t be told whose bag it is .
Will we visit the Great Wall tomorrow? It has not been decided.
Whether we will visit the Great Wall has not been decided.
It has not been decided whether we will visit the Great Wall .
When he will come is not known.
但是 what is the matter 和 what is wrong 不可 改变语序 2).连接词that在从句中无实际意义,起引导作用, 不作任何成分,但不能省略. He will not come to the meeting this evening is true.
注意:在主语从句中用来表示惊奇、不 相信、惋惜、理应如此等语气时，谓 语动词要用虚拟语气 “ should +do”， 常用的句型有：
It is necessary \ essential that…. It’s important that…. It’s natural that…. It's strange that …
5).为避免主语冗长,句子头重脚轻,经常用it作形式主语, 主语从句放在后面作真正的主语.
例: It is well known/reported/thought/said/… that… It is clear/necessary/certain/true/doubtful/… that… It is a pity/a shame/an honour/… that… It doesn’t matter whether…/ It seems that… It happens that…
1. ____ we can't get seems better than ____ we
When will we start tomorrow?
It will be told soon.
When we will start tomorrow will be told soon.
我们将怎样制定计划已经被老师解释清楚了.
How we will make the plan has been explained clearly by the teacher. 为什么他来这里还是不被人所知道.
Why he comes here is not known. 1.为什么有时侯用that, whether,有时侯用连接代词 , 或 着有时候用连接副词? 2.它的语序有没有变化?
2.总结:
1).主语从句一律用陈述句语序,即主语在前,谓 语在后. When will he come is not known. 错误
从 句
表语从句 ( The Predicative Clause)
同位语从句 ( The Appositive Clause)
主语从句
在复合句中作主句的主语. 引导词有连词that (that 不可省略), whether; 连接代词有who, what ,which; 连接副词 when ,where, how, why 等.如:
What does he need? It is money. What he needs is money. 无论你刚才说什么都是对的.
Whatever you said is all right.
3).连接副词: when, where, why, how, how many, how much ,how long, how soon, how often
单个的主语从句作主语时，谓 语动词用单数形式。如果是两 个或两个以上的主语从句作主 语，谓语动词则用复数形式。
Where and when he was born has not been found. When the person was murdered and why he was murdered are still unknown.
1).连接词: that, whether He is a famous singer.
It is known to us. 1.That he is a famous singer is known to us. (It is known to us that he is a famous singer.)