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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。
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。
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。
名词性从句详解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。
一.语法讲解1.主语从句主语从句在句中做主语。
它可以放在主句谓语动词之前，但多数情况由it作形式主语，而把主语从句放在主句之后。
例如：Who did that is known to all.It is interesting that you should like him.2.表语从句表语从句在句中作表语，位于主句中的系动词之后。
如：The question is who can complete the difficult task.表语从句不能用if引导，但可用as if引导。
例如：He looked as if he was going to cry．3.同位语从句同位语从句跟在名词后面，进一步说明该名词的具体内容。
引导同位语从句的名词主要有fact，news，promise，idea，truth等。
连接词用that（不用which），及连接副词how，when，where，why等。
例如：His delay is due to the fact that the car went wrong halfway．The news that our team has won the match is true.She asked the reason why there was a delay．4.宾语从句1.宾语从句在句中作及物动词或介词的宾语。
例如：We can learn what we did not know．He will talk to us about what he saw in the U.S.如果主句的谓语动词是及物动词make，find，see，hear等，则把宾语从句置于宾语补足语之后，用it作为形式宾语。
名词性从句的语法解析名词性从句是指在句中充当名词的成分的从句，可以作主语、宾语、表语、同位语等。
名词性从句的引导词有“从属连词”和“连接代词”两种。
一、主语从句主语从句在句中充当主语，常引导主语从句的连接词有“that”和“whether/if”。
其中，“that”在口语中常省略，而“whether/if”则一般用于句中有“or not”时。
例如：1. That he passed the exam is good news.（非正式：He passed the exam is good news.）2. Whether he will come to the party is still uncertain.（非正式：If he will come to the party is still uncertain.）二、宾语从句宾语从句在句中充当宾语，常引导宾语从句的连接词有“that”、“whether/if”、“what”和“who/whom”。
其中，“that”在口语中常省略。
例如：1. She said that she would go shopping later.（非正式：She said she would go shopping later.）2. I don't know whether/if he is coming to the party.（非正式：I don't know if he is coming to the party.）3. She asked me what I wanted for dinner.4. He asked who/whom I was talking to on the phone.三、表语从句表语从句在句中充当表语，常引导表语从句的连接词有“that”、“whether/if”和“what”。
例如：1. The important thing is that we are safe.（非正式：The important thing is we are safe.）2. The question is whether/if he will pass the exam.3. The problem is what we should do next.四、同位语从句同位语从句通常用来进一步解释说明某个名词或代词指代的内容，引导同位语从句的连接词有“that”、“whether/if”、“what”、“who/whom”等。
