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The Subject Clause
When a Sentence Becomes a Subject
探索句子的奥秘 —— 主语从句
A Thought-Provoking Quote
“What you do today can improve all your tomorrows.”
思考一下 ( Think about it):
1. What is the subject (主语) of this sentence
2. Is it a single word or a group of words
What is a Subject Clause
Definition / 定义
A subject clause is a clause that functions as the subject of a sentence. It acts like a noun.
主语从句是在句子中充当主语的从句，其语法功能与名词完全相同，因此也被称为“名词性从句”。
What is a Subject Clause
Structure / 结构
Subject Clause + Predicate
（引导词 + 从句内容）
充当整个句子的主语部分，后跟主句谓语。
What is a Subject Clause
Examples / 示例对比
● Simple Sentence
His ideais brilliant.
（主语：名词短语）
● Complex Sentence
That he came up with this ideais brilliant.
（主语：完整句子）
The Key: Choosing the Right Conjunction
从属连词 (Subordinating)
引导词：that, whether
功能：that无意义，仅起连接作用， 不可省略； whether 表“是否”，起连接作用。
充当从句成分？否 (No)
That he won the game surprised everyone.
Whether she will come is still unknown.
The Key: Choosing the Right Conjunction
连接代词 (Pronouns)
引导词：what, who, whom, whose, which
功能：连接句子 + 充当主语、宾语、表语或定语。
充当从句成分？是 (Yes)
What he said is very important.
"What" 作 said 的宾语 (Object)
The Key: Choosing the Right Conjunction
连接副词 (Adverbs)
引导词：when, where, why, how
功能：连接句子 + 充当状语 (时间、地点、原因、方式)。
充当从句成分？是 (Yes)
How he solved the problems is a mystery.
"How" 作 solved 的方式状语 (Adverbial)
that or what A Common Puzzle
that— 只起连接作用，不充当成分
That he is honest is known to all.
分析：从句 "he is honest" 本身结构完整，that 仅作为连词连接主从句，不具实际含义，也不充当成分。
what— 既起连接作用，又充当成分
What he said is true.
分析：从句中 "said" 缺宾语，what 既连接主从句，又充当 "said" 的宾语，意为“...的话/内容”。
记忆口诀 (Mnemonic) ·that 只连接，what 要充当
whether or if
核心规则 (Rule)：当引导主语从句作句子主语时，只能用 whether，绝对不能用 if。
正确 (Correct)
“Whether we will go campingdepends on the weather.”
（主语从句作主语 ）
错误 (Incorrect)
“If we will go campingdepends on the weather.”
（主语从句不能用 if 引导 ）
用法拓展 (Extension)：`if` 仅能引导宾语从句。例：I don't knowif / whetherhe will come.
Two Golden Rules
01. 语序 (Word Order)
主语从句必须使用陈述语序 (Subject + Verb)，不可使用疑问语序。
Correct: I don't know when the meeting will start.
Incorrect: I don't know when will the meeting start.
Two Golden Rules
02. 主谓一致 (Subject-verb Agreement)
当主语从句作句子主语时，整个从句视为一个整体，主句的谓语动词通常要用单数形式 (Singular Form)。
What he says is not important.
When they will arrive is still a question.
Challenge Time!
01. ______ he will come to the party remains a question.
A. If B. That C. Whether D. What
02. ______ surprised me most was his attitude towards his studies.
A. That B. What C. Which D. Who
03. ______ the earth is round is a fact.
A. That B. What C. If D. Whether
04. ______ we will have a picnic tomorrow depends on the weather.
A. If B. Whether C. That D. Where
05. ______ he got so angry confused me.
A. when B. why C. what D. where
Correct Answers
1.C 2.B 3.A
4.B 5.B
Transform the Sentences
Combine the two sentences into one using a subject clause.
01
He will come. It is certain.
That he will come is certain.
(拓展: It is certain that he will come.)*
02
What did he say It is not clear.
What he said is not clear.
03
Where did they go It's a secret.
Where they went is a secret.
Summary
What: Subject Clause
A type of noun clause that functions as the subject of a main clause.
How: Common Markers
Introduced bythat, whether, orwh-words (what, who, where, etc.).
Key Rules to Remember
Distinguish:that vs. what | whether vs. if
Syntax: Always use statement word order.
Agreement: The main verb is usually in singular form.
The Subject Clause (主语从句)
1. Definition (定义)
A clause that acts as the subject of a complete sentence. It functions as a noun.
在复合句中充当主语的从句，其功能相当于名词。
2. Common Conjunctions (引导词)
That: 无意义，不充当成分 (e.g., That he is late is true.)
Whether: 表“是否”，不充当成分 (e.g., Whether he will come is unknown.)
Wh- words: 在从句中充当成分 (e.g., What he said is important.)
3. Key Rules (关键规则)
Statement Word Order:从句内部必须使用陈述语序，而非疑问语序。
Singular Verb:主语从句视为单数，主句谓语动词通常用单数形式。
4. Formal Subject (形式主语)
It is truethat the earth is round.
Note: 当主语从句较长时，为避免头重脚轻，常将 it 置于句首作形式主语，而将真正的主语从句移至句末。
THANK YOU
感谢聆听 · 敬请指正
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