11C 名词性从句：把一件事、一个问题或未知信息放进名词位置

本章学习目标

学完本章，你应该能够：

1. 根据意义选择 that、whether/if 或疑问词引导名词性从句。
2. 正确使用陈述语序，处理疑问词本身作主语的情况。
3. 识别主语从句、宾语从句、表语从句和同位语/内容从句。
4. 区分 that 与 what、同位语从句与定语从句。
5. 在间接引语中合理处理人称、时间和时态关系。

学前诊断：从句里还要保持疑问语序吗

选择：I wonder where he is 与 I wonder where is he，哪一句正确？如果疑问词本身作主语，规则会怎样表现？

1. 核心直觉：名词位置可以装进“整件事”

名词可以做主语或宾语：

• The decision surprised us.
• We understood the decision.

如果要放进去的不是一个名词，而是一整件事，可以使用名词性从句：

• That the meeting was cancelled surprised us.
• We understood why the meeting was cancelled.

第一句把“会议被取消这件事”当作主语；第二句把“会议为什么被取消”当作 understood 的宾语。

2. 三种引导方式，表达三类信息

2.1 that：引入一个陈述内容

I believe that the figures are accurate.

the figures are accurate 本身是完整陈述；that 只把这个陈述接入大句，通常不在从句内部做主语、宾语或状语。

宾语从句中的 that 常可省略：

I believe the figures are accurate.

但在句首主语从句、同位语内容从句或容易产生误读时，通常保留。

2.2 whether / if：引入“是否”问题

We need to know whether the figures are accurate.

这里不预设数据准确，只提出两种可能。

if 在许多宾语从句中可替代 whether：

I wonder if the figures are accurate.

但以下位置通常用 whether：

1. 句首主语从句：Whether the plan will work remains uncertain.
2. 介词后：It depends on whether we have enough time.
3. to do 前：We must decide whether to continue.
4. 与 or not 紧连：I don't know whether or not she agrees.
5. 正式写作中强调两种选择时。

2.3 疑问词：引入未知的人、事、地点、时间、原因或方式

• I know who sent the message.
• I know what the message means.
• I know where the meeting will be held.
• I know when the meeting begins.
• I know why the schedule changed.
• I know how the system works.

疑问词不仅连接，还在从句内部承担成分或表达关系。

3. that、whether 和疑问词怎样选

先判断你要表达哪一种信息：

比较：

• I know that she resigned. 我知道她辞职了。
• I don't know whether she resigned. 我不知道她是否辞职。
• I don't know why she resigned. 我不知道她为何辞职。

先确定“陈述、是否、还是未知信息”，再选引导词。

4. 名词性从句使用陈述语序

直接问题：

Where does she work?

进入名词性从句后：

Do you know where she works?

从句不再直接向听者提问，因此不用一般疑问句倒装，也不额外使用 do/does/did。

疑问词本身作主语时

Who called you?

I wonder who called you.

两句表面顺序相同，因为 who 本身就是主语，并没有发生助动词倒装。

5. 主语从句：整件事作主语

That the data was incomplete caused a delay.

这个结构语法正确，但句首从句较重。这个例子更自然的表达是：

The fact that the data was incomplete caused a delay.

在适合外置的结构中，英语常使用形式主语 it：

• It is clear that the plan needs revision.
• It seems that the train has been delayed.
• It matters whether everyone agrees.
• It is uncertain when the results will be announced.

what 从句作主语时不再需要 that：

What we need is more time.

what 自带“……的东西/事情”的含义，接近 the thing(s) that。

6. 宾语从句：动词、介词或形容词后的内容

6.1 动词后的宾语从句

• She explained that the rule had changed.
• We asked whether the rule applied to everyone.
• No one knew how the error had occurred.

能否省略 that 要看清晰度。一个句子连续出现多个动词或多个并列宾语从句时，保留 that 更易读：

The report states that costs have risen and that demand has fallen.

6.2 介词后的名词性从句

The decision depends on whether the funding is approved.

介词后常接 whether 或疑问词从句，通常不直接接 that 从句。可以改用 the fact that：

We were surprised by the fact that the funding was approved.

6.3 形容词后的内容从句

I am certain that the figures are correct.

这类从句补充说明 certain, glad, aware, afraid, sure 等形容词的内容。不同语法体系可能称为补语从句或形容词补足语；学习重点仍是判断它承载什么内容。

7. 表语从句：在系动词后解释主语内容

The problem is that we lack reliable data.

that 从句具体说明“问题是什么”。其他形式：

• The question is whether we should wait.
• This is what I meant.
• The issue is how we can reduce the cost.

常见错误：

• 不推荐：The reason is because the data was incomplete.
• 更清楚：The reason is that the data was incomplete.
• 或：The delay occurred because the data was incomplete.

8. 同位语/内容从句：说明抽象名词的具体内容

The news that the project had been approved delighted the team.

从句说明 news 的内容。常见可接内容从句的名词有：

fact, idea, news, belief, claim, possibility, question, suggestion, evidence, hope

与定语从句区分

The news that the project had been approved delighted the team.

• 从句内部完整：the project had been approved
• that 不充当成分
• 从句解释消息的内容

The news that the reporter announced delighted the team.

• 从句内部缺宾语：the reporter announced ___
• that 回指 news，在从句中作宾语
• 从句限定是哪条消息

同位语内容从句回答“这个名词的内容是什么”；定语从句回答“是哪一个/什么样的名词”。

9. 关于“宾语补语从句”

有些传统资料会把位于复杂及物结构中、用来说明宾语内容的名词性结构称为“宾语补语从句”。这个名称并不是所有语法体系都单列。

例如：

We call this what makes the method effective.

what makes the method effective 是名词性结构，在 call A B 中说明 this 被称为什么。对学习者来说，更稳定的做法是：

1. 先认出 call + 宾语 + 补语 骨架。
2. 再判断补语位置由名词短语还是名词性从句承担。

不必为了记住第五个名称而忽略真实结构。

10. that 与 what：完整陈述还是缺一个成分

比较：

• I know that she said something. 从句本身完整；that 只连接。
• I know what she said. 从句为 she said ___；what 同时表示她说的内容并作宾语。

判断法：

1. 暂时去掉引导词。
2. 检查从句是否主宾完整。
3. 完整陈述通常考虑 that；缺“什么/……的东西”通常考虑 what。

不能写 what she said it，因为 what 已经占据宾语位置。

11. 间接引语中的时态与指代

直接引语：Maya said, "I am tired now."

间接引语：Maya said that she was tired then.

常见变化包括：

• I 根据说话者改为 she/he。
• now 可根据叙述视角改为 then。
• 主句为过去时，报告内容常发生时态后移：am → was, will → would, have finished → had finished。

但时态后移不是机械规则。若内容现在仍为事实，保留现在时可能更合适：

The teacher explained that water boils at 100°C at sea level.

12. 阅读长名词性从句

What the researchers discovered after they had reviewed the data was that the original assumption was wrong.

1. 主句骨架：X was Y.
2. X：What the researchers discovered ...，主语从句。
3. X 内部还有时间状语从句：after they had reviewed the data。
4. Y：that the original assumption was wrong，表语从句。

整句表示：研究人员审查数据后发现的事情是，原来的假设错了。

13. 写作时的四项检查

1. 你要嵌入的是陈述、是否问题还是未知信息？
2. 从句是否使用陈述语序？
3. that 从句是否完整，what/who/which 是否真正填补了空位？
4. 从句过长时，是否应使用形式主语 it、the fact that 或拆句提高可读性？

14. 高频错误

1. I wonder where does she work. → I wonder where she works.
2. Can you tell me what is the answer? → Can you tell me what the answer is?
3. I don't know that he will come. 若表示“是否”，改为 whether/if。
4. I know what he said it. → 删除 it。
5. It depends on if we have time. 日常语境可见，但正式写作和介词后优先 whether。
6. The fact he resigned shocked us. → 同位语内容从句通常保留 that。

15. 快速复习清单

• 名词性从句把陈述、问题或未知信息放进名词位置。
• that 引入完整陈述；whether/if 表示是否；疑问词承担具体未知信息。
• 名词性从句通常用陈述语序。
• 疑问词作主语时，不需要再补一个主语。
• 主语从句较长时常用形式主语或 the fact that。
• 同位语从句解释名词内容，定语从句修饰并在内部留下空位。
• 间接引语的时态后移取决于叙述视角，不是机械替换。

16. 自检题

题目

1. 选择：I believe ___ the results are reliable. (that / what)
2. 选择：I don't know ___ the results are reliable. (that / whether)
3. 改错：Could you explain how does this machine work?
4. 判断：Who sent the message remains unknown 中为什么 who 后没有另一个主语？
5. 改写为形式主语：That the deadline changed is obvious.
6. 填空：The decision depends on ___ we receive approval. (if / whether)
7. 区分从句：the claim that the data was false 与 the claim that the journalist repeated。
8. 改错：I understand what you mean it.
9. 翻译：问题是我们是否有足够的证据。
10. 将直接引语改为间接引语：Lena said, “I will finish the report tomorrow.”
11. 找出主语从句和表语从句：What surprised us was that everyone arrived on time.
12. 用 the fact that 写一句表达原因或背景的句子。