必修三语法：主语从句1

主语从句——Noun clauses as the subject主语从句如果一个句子在复合句中充当一个主语, 那么这个句子就是主语从句。

①That he finished writing the composition in such a short time surprised us all.②What we need are good doctors.③Whom we must study for is a question of great importance.1.主语从句的连接词1).连接词: that, whether①.That he will win is certain.②.Whether he’ll join us in the discussion is of great importance.2).连接代词: who, what, which, whom , whose, whoever, whatever, whichever①.It is clear who is afraid of having a change in land ownership.②.What India needs is a law to make land ownership fairer.3).连接副词: when, where, why, how, how many, how much , how long, how soon, how often①When we’ll start tomorrow will be told soon.②Where we can buy oxen is something we need to find out.③Why he came here is not known.④How we can protect the grain from damp needs to be discussed.【连接词】1. that——That t he earth moves around the sun is well known.2. whether——Whether he will come or not is not known yet.3. who ——Who will be sent there has not been decided.4. what——What you need is more practice.5. which——Which one is the best is not clear.6. when, where ——Where he has gone is a question.7. why, how——Why there is gravity is hard to understand.How he can earn a living in Britain remains a big problem.8. whoever、whatever、whichever可引导主语从句。

Noun Clauses
名词性从句
简单句、并列句、复合句
简单句：Many students took part in the sports meeting last year. 并列句: The school sports meeting was held last year and many students took part in it. but, or 主从复合句: •I’ll help you lose weight if you eat here every day. •He is the teacher who teaches us physics. •Everybody knows that the earth goes around the sun.
Objective Clause
1. 有从属连词、连接代词和连接副词
在句中不担任成分 在句中担任成分
•that, whether, if (是否)
•what, who, whom, whose, which, whoever, whichever, whatever, whomever •when, where, why, how
Predicative Clause
1. 有从属连词、连接代词和连接副词 that, whether, as if •what, who, whom, whose, which, whoever, whichever, whatever, whomever •when, where, why, how 2. 表语从句要用陈述语序 •The reason why … is that … •It is because …
4. He didn’t tell me _____ when he would come

It happened that...
碰巧……
It occurred to me that…我突然想起…
It appears/seems that… 似乎，好像…
It turned out that… 原来…
*_I_t_h_a_p_p_e_n_e_d__t_h_a_t_(刚好)I was out yesterday.
主语从句的规律：
例4. That whether he will help others is a fact.
正：That he will help others is a fact.
规律四、主语从句中的连词不能重叠使用。
主语从句的规律： 例5. When he will come are a puzzle. 正：When he will come is a puzzle.
4) 连接副词when, where, how ,why
1.When we will leave（我们什么时候离开） hasn’t been decided. 2.How he got there (他怎么到那的） is a secret. 3. Why he cried (他为什么哭）is not clear. 4. Where the meeting （会议将在哪里举行） will be held is not known.
主语是？
Which part serves as subject in each sentence? 1. You are a student. 2. Smoking is bad for you. 3. To find your way can be a problem. 4. “How do you do?” is a greeting.

【高中英语】高中英语知识点：主语从句主语从句的概念：如果一个句子在复合句中充当一个主语，那么这个句子就是主语从句。

主语从句通常由从属连词that，whether，if和连接代词what，who，whichwhatever，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。

主语从句用法：1、主语从句的引导词：主语从句通常由连词that和whether、相连接代词或相连接副词以及关系代词型what鼓励：如：thatheisstillaliveisawonder.他还活着，真是奇迹。

whenwearrivedoesn'tmatter.什么时候至没关系。

whatweneedismoney.我们需要的是钱。

whatiwanttoknowisthis.我想要晓得的就是这一点。

whethertheywouldsupportuswasaproblem.他们是否会支持我们还是一个问题。

2、主语从句与形式主语it：有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。

这分三种情况：(1)对于以连词that鼓励的主语从句，通常用形式主语代主语从句：(2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：例如：whethertheywouldsupportuswasaproblem.他们与否可以积极支持我们还是一个问题。

itwasaproblemwhethertheywouldsupportus.他们是否会支持我们还是一个问题。

(3)对关系代词型what鼓励的主语从句，通常不必形式主语，总是主语从句放到句首：如：whatweneedismoney.我们需要的是钱。

whatiwanttoknowisthis.我想要晓得的就是这一点。

(4)如果句子是疑问句，则必须用带形式主语it的结构：例如：isittruethatheisthegirl'sfather?他就是那女孩的父亲，就是真的吗？howisitthatyouarelateagain?你怎么又迟到了？3、连词that的省略问题：引导主语从句的连词that有时可省，有时不能省，其原则是：若that鼓励的主语从句轻易坐落于句首，则that无法省略；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that则可以省略：例如：thatyoudidn'tgotothetalkwasapity.很惋惜你没回去听到报告。