名词性从句--主语从句
名词性从句—— 主语从句、宾语从句、表语从句、同位语从句档
主语从句
一、 that从句做主语
1、that不能省略，常用it做形式主语
That the thief has entered his room is obvious.
=It is obvious that the thief has entered the room.
2、宾语从句中，当主句谓语动词是一般过去时，从句谓语动词要用与过去相关的时态
She asked me where I was going.
I wondered how he could make such rapid progress in French.
注意：若从句表达的是客观真理，仍用一般现在时
It is said that they have won the game.
常用过去分词：said, believed, reported, hoped, claimed, known, announced, suggested
此句型可转换成另一结构：
主语 + be + 过去分词 + to do / to have done
= He is said to go to America.
4) It + vi. +that从句
It seems that something is wrong with the machine.
常用vi：happen, appear, seem, turn out
二、 wh-从句做主语
I would have drowned，but that you had saved me in the water.
名词性从句与主语从句
名词性从句与主语从句在英语语法中，名词性从句和主语从句是重要的从句类型。
它们都属于从属从句，扮演着整个句子的一个成分。
本文将详细介绍名词性从句和主语从句的定义、特点和用法，并举例说明其在实际应用中的运用。
一、名词性从句的定义和特点1. 定义：名词性从句是指在复合句中充当名词成分的从句。
它可以充当主语、宾语、表语和同位语等。
2. 特点：a. 通常由连词that, whether/if, who, whom, which, what, when, where, why, how等引导；b. 在从句中担任名词的职能，整个从句作为整体在句中起到名词的作用；c. 可以替换为一个单词或短语，使句子更加简洁明了；d. 名词性从句的引导词根据从句所充当的成分来选择。
二、名词性从句的用法名词性从句的常见用法包括主语从句、宾语从句、表语从句和同位语从句。
下面将分别进行讲解。
1. 主语从句主语从句在句子中充当主语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - Whether we can finish the project on time is still uncertain.- That he stole the money is beyond doubt.- How to solve this problem remains a challenge.2. 宾语从句宾语从句在句子中充当宾语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - She asked me where I had been all day.- I don't know if he will come to the party.- We should consider whether this plan is feasible.3. 表语从句表语从句在句子中充当表语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
主语从句
简单辨认it作形式主语与强调句型的 方法
• 去掉it be that 还能成为一个完整的句子就是 强调句型 • eg:it was mary who set the record.是玛丽创 造了奇迹。 • Mary set the record.
三、用it作形式主语的主语从句结构
• 1)It is + adj. / n. +从句
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• 2、It is said/reported结构中主语不可提前 • eg:据说这条公路明年通车。 • It is said that the expressway will be open to traffic next year.(T) • That the expressway will be open to traffic next year is said.(F)
二、it作形式主语与it引导强调句的 比较
• it作形式主语主要是为了平衡句子结构;it引 导强调句是为了对某一部分进行强调，固 定结构it+be+that(who/whom/whose/where) • eg：It was ordered that the goods be sent there by plane.根据命令，那些货物必须空 运到那里。（it作形式主语） • It was last summer that he graduated from the university.他是去年夏天从那所大学毕业 的（强调句型，强调“去年”）
当what引导的主语从句表示“· · · 的东 西”时，一般不用it作形式主语
• 当what引导的主语从句表示“· · · 的东西”时， 一般不用it作形式主语 • Eg :What angered me most was he total lack of remorse.(正确) • It angered me most was he total lack of remorse.(错误) • It was his total lack of remorse that angred me most.(正确、强调句型！) • Whatever/whoever/whichever引导的句子一 般也不用it作形式主语
名词性从句-主语从句
主语从句的构成
主语从句的构成包括引导词和陈述句两部分。引导词是主语从句的开头，陈述句则是主语从句的具体 内容。
例如：“That he will come is certain.”这个句子中，“that”是引导词，“he will come”是陈述 句，合起来构成了主语从句“that he will come”。
特殊情况下的语序变化
在某些特殊情况下，如强调或倒装句中，主语从句的语 序可能会发生变化。例如，“It is he who is responsible for the accident.”（是他负责这起事故。）
主语从句的省略
省略条件
主语从句在某些情况下可以省略，通常是在从句内容与主句内容重复或从句内容不重要的情况下。
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名词性从句-主语从 句
目录
• 主语从句的定义 • 主语从句的引导词 • 主语从句的句型结构 • 主语从句的用法 • 主语从句的注意事项
01
主语从句的定义
什么是主语从句
主语从句是名词性从句的一种，在句子中充当主语成分，表示句子中的主要内容。 主语从句通常由一个连词引导，如that、whether等，后面跟随一个完整的句子。
引导词who
总结词
表示人或身份
详细描述
who作为主语从句的引导词，通常表示人或身份，在句子中起到连接主语和谓语的作用。例如，“Who will win the game is still unknown.”（谁将赢得比赛仍然未知。）
引导词which
总结词
表示选择或范围
详细描述
which作为主语从句的引导词，通常表示选择或范围，在句子中起到连接主语和 谓语的作用。例如，“Which team will win the game is still unknown.” （哪个队将赢得比赛仍然未知。）
名词性从句和主语从句的区别
名词性从句和主语从句的区别名词性从句和主语从句是英语语法中两个重要的从句类型，它们在使用和功能上有着一些区别。
本文将对名词性从句和主语从句的区别进行详细介绍。
一、名词性从句的定义和功能名词性从句是在句子中充当名词的作用，可以作为主语、宾语、表语或同位语。
名词性从句通常由连接代词（如what, who, whom, which, whoever, whatever）或连接副词（如when, where, why, how）引导。
名词性从句在句子中的功能类似于名词，用于表达陈述、提问、建议、愿望、要求、目的、理由等。
二、主语从句的定义和功能主语从句作为句子的主语，从句中的谓语动词所表示的是主句中的主谓关系。
主语从句通常由连接代词（如what, who, whom, which, whoever, whatever）或连接副词（如when, where, why, how）引导。
主语从句在句子中的功能是充当整个句子的主语，用于表达主谓关系，而且不能省略。
三、名词性从句和主语从句的区别1.位置不同：- 名词性从句可以出现在句子的主语、宾语、表语和同位语等位置，位置较为灵活。
- 主语从句只能作为句子的主语出现，位置不可变。
2.引导词不同：- 名词性从句常由连接代词或连接副词引导。
- 主语从句也常由连接代词或连接副词引导，但通常只由连接代词引导。
3.结构不同：- 名词性从句在结构上是完整的句子，包含主语、谓语和其他成分。
- 主语从句在结构上只包含主语部分，谓语动词在主句中。
4.可替换性不同：- 名词性从句可以被代替为一个单词或一个词组。
- 主语从句在句子中起到主语的作用，不能被代替。
四、名词性从句和主语从句的例句说明1. 名词性从句的例句：- I don't know what he said.（主语从句作宾语）- Tell me where she lives.（主语从句作宾语）2. 主语从句的例句：- What he said is interesting.（名词性从句作主语）- Where she lives is a mystery.（名词性从句作主语）综上所述，名词性从句和主语从句在使用和功能上存在区别。
名词性从句和主语从句的差异
名词性从句和主语从句的差异名词性从句和主语从句是英语语法中常见的两种从句结构。
尽管它们在句法结构上有一些相似之处，但它们在语法功能和用法上存在显著差异。
本文将详细介绍名词性从句和主语从句的差异，以及它们在句子中的应用。
1. 名词性从句名词性从句是一个完整的句子，其在句子中担任名词的功能。
名词性从句可以充当主语、宾语、表语或同位语。
它通常由连接词引导，如what、where、when、who、which、whether等。
名词性从句通常以陈述句的形式出现，例如：- What she said is true.（她所说的是真的。
）（名词性从句作为主语）- I don't know where he went.（我不知道他去了哪里。
）（名词性从句作为宾语）- His question is whether she will come or not.（他的问题是她是否会来。
）（名词性从句作为表语）- The fact that he passed the exam surprised us.（他通过考试的事实使我们很吃惊。
）（名词性从句作为同位语）名词性从句可以在句子中起到名词的作用，承担特定的语法角色，并且可以被代词所替代。
2. 主语从句主语从句是一个完整的句子，用作主句中的主语。
它通常由连接词引导，如that、whether、who、which等。
主语从句通常以陈述句的形式出现，例如：- That he doesn't like tomatoes surprises me.（他不喜欢西红柿让我很惊讶。
）- Whether we should go camping is still undecided.（我们是否应该去露营还没有决定。
）主语从句在句子中起到名词的作用，承担主语的语法角色。
它和名词性从句一样，在结构和功能上都类似，但主语从句只能用于句子的主语部分。
3. 尽管名词性从句和主语从句之间存在一些相似之处，但它们在语法功能和用法上有一些显著差异。
名词性从句总结
名词性从句总结名词性从句是一个句子，在句子中充当其他句子成分的词组。
它作为名词的补充，可以充当主语、宾语、表语、同位语或介词宾语。
名词性从句在句子中起着重要的作用，可以使句子结构更加复杂丰富。
下面将对名词性从句的种类、结构和用法进行总结。
一、名词性从句的种类名词性从句包括主语从句、宾语从句、表语从句和同位语从句。
它们在句子中的作用不同，下面将对它们进行详细的介绍。
1. 主语从句主语从句作为句子的主语，通常以“that”引导，也可以用“whether/if”引导。
例如：- That he is late is very frustrating. (他迟到了很令人沮丧。
)- Whether she can come or not is still uncertain. (她是否能来还不确定。
)2. 宾语从句宾语从句作为句子的宾语，通常以“that”引导，也可以用“whether/if”引导。
例如：- I hope that you can join us for the party. (我希望你能参加我们的派对。
)- He doesn't know whether he should go or not. (他不知道他是否应该去。
)3. 表语从句表语从句作为句子的表语，通常以“that”引导，也可以用“whether/if”引导。
例如：- His main concern is that he won't pass the exam. (他最担心的是他不会通过考试。
)- The question is whether we should continue or stop. (问题是我们是继续还是停下来。
)4. 同位语从句同位语从句修饰前面的名词，通常以“that”引导，也可以用“whether/if”引导。
例如：- The news that he won the competition is exciting. (他赢得比赛的消息令人兴奋。
名词性从句有哪些
名词性从句有哪些名词性从句共有四种，分别是主语从句（整个从句在主句中做主语），表语从句（整个从句在主句中做表语），同位语从句（整个从句在主句中做同位语），宾语从句四类（整个从句在主句中做宾语）。
名词性从句有哪些1、主语从句例如：It + be + 形容词/名词/动词过去分词 + that 从句It is strangethat he knows nothing about it.从句：He knows nothing about it.主句：It is strange something (= He knows nothing about it).连接词在从句中是否充当成分：否连接词是否可省：否2、宾语从句例如：that 引导的宾语从句I think that English is important.从句：English is important.主句：I think something (= English is important).连接词在从句中是否充当成分：否连接词是否可省：是3、表语从句用法和结构同宾语从句，区别在于：系动词后面所接的从句为表语从句，而及物动词后面所接的从句为宾语从句。
例如：- that 引导的表语从句The truth is that English is important.从句：English is important.主句：The truth is something (= that English is important).4、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。
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，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。
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It is a fact that John won a gold medal. 2. That I missed the beginning of the film is a pity.
It is a pity that I missed the beginning of the film . 3. That we will go travelling is good news. It is good news that we will go travelling.
形式主语
真正主语
第一种：
形式主语It代替that 主语从句
1. It is + 名词 + that 从句 It is a pity that… It is a shame that …
It is a fact that …. It is an honor that…. 等等
形式主语It代替that 主语从句
主语
seems
possible.动词 That Tom will win the tennis game
seems
表语
possible.
主句
• 主语从句： 在主句中担当主语的是一个从句，这 个从句就叫主语从句。 • 引导词： 从属连词：that, whether • 关系代词：who, whom, what • which, whose • 关系副词：when, where, why
例句 Whom did the boy help? She is an old woman.
Whom the boy helped is an old woman.
Where does he live? It is Beijing. Where he lives is Beijing.
关系代词：
what which who whom等引导主语从句
It + be + 过去分词 + that…
4. That it will rain tomorrow is believed It is believed that it will rain tomorrow. 5.That the waiter works hard is thought. It is thought that the waiter works hard. 6. That the American president will visit China is reported. It is reported that the American President will visit China.
由that引导主语从句
例句： 把两句话合并成一句话 1. Light travels in straight lines. It is known to all.
That light travels in straight lines is known to all.
2. We should wash our hands before meals. It is necessary.
It is reported that ten persons died in the accident.
3. That the earth was not round was believed in ancient times. It was believed in ancient times that the earth was not round.
is necessary. 4. Students say hello to their teachers. It is polite.
That students say hello to their teachers.
is polite.
由that引导主语从句
• 把两句话合并成一句话 5. Your mother didn’t attend the party yesterday. It is a pity.
第四种:形式主语It代替that 主语从句 • It + be + 过去分词 + that…
• It is said that … 据说…..
• It is reported that
据报道…
众所周知….
• It is known to all that …. • It is believed that …. • It is thought that ….
把两句话合并成一句话 1.What do their parents need? It is more experience. What their parents need is more experience.
2.Which doctors will be sent to Wenchuan? It has not been decided. Which doctors will be sent to Wenchuan hasn’t been decided.
It is right that light travels in straight lines. That he got a gold medal is real. It is real that he got a gold medal.
把下列句子用it 做形式主语
1. That Tom will win the game is possible.
名词性从句（一 ）
名 词 性 从 句
主 语 从 句
宾 语 从 句
同 位 语 从 句
表 语 从 句
主语从句
• 把两句话合并成一句话 1. Tom will win the tennis game. It seems impossible.
That Tom will win the tennis game
It is necessary that we must complete this work before 5 o’clcok.
第三种：形式主语It代替that 主语从句
It +不及物动词 +that …
1) That I met my Geography teacher in the street happened. It happened that I met my Geography teacher in the street .
由that引导主语从句
• 把两句话合并成一句话
7. There will be rainy tomorrow. It is possible. That there will be rainy tomorrow is possible.
8.Teenagers smoke. It is wrong. That teenagers smoke is wrong.
由 whether （“是否”）引导的主语从句
• 在主语从句中只能用 此意义时不能用
whether （是否），
if 替换。
形式主语It代替that 主语从句
That we study English well is necessary.
It
is necessary that we study English well.
人们相信… 人们认为….
It + be + 过去分词 + that…
1. That his father has gone to Tianjin is said. It is said that his father has gone to Tianjin. 2. That ten persons died in the accident is reported.
2) That I picked a red wallet on the way to school happened.
It happened that I picked a red wallet on the way to school. 3) That the manager and the boss went travelling happened. It happened that the manager and the boss went travelling.
It is possible that Tom will win the game. 2. That we should wash our hands before meals is necessary. It is necessary that we should wash our hands before meals. 3. That we must complete this work before 5 o’clcock is necessary.
第二种：形式主语It代替that 主语从句
It is + 形容词+ that…
• It is important that…
• It is necessary that…
• It is polite that…. • It is wrong that…等等
把两句话合并成一句话
例句 That light travels in straight lines is right
由 whether （“是否”）引导的主语从句
1. Will he go abroad? It is not known.
Whether he will go abroad is not known.
2. Will it rain tomorrow? It is not known.