Advanced Noun Clauses C1–C2: That, What, Whether, Whoever

1. Let a clause carry a complete idea

A noun clause can occupy a position often filled by a noun phrase. In I know the answer and I know what she decided, the bold parts complete the same verb.

Three useful positions
Position	Example	Function
Subject	That the figures conflict is worrying.	What is worrying? The whole fact.
Object	We must establish whether the figures are accurate.	What must we establish? The answer to this question.
Complement after be	The issue is what we should do next.	The clause identifies the issue.

Advanced focus: choose the clause for its meaning, then control its internal word order and its place in the larger sentence.

“Noun clause” is a useful teaching umbrella. More detailed grammars distinguish content clauses, embedded interrogatives and fused or free relatives. The contrasts below help you use them accurately.

2. That introduces a proposition; what fills a role

That + a complete clause

I accept that the method has limitations.

After that, the clause is complete: the method has limitations. That connects the proposition to accept; it is not the object of has.

What supplies a missing element

I accept what the evidence shows.

Here what means “the thing(s) that” and supplies the object of shows. “The evidence shows” needs that object for the intended meaning.

Two readings of what: “I value what she wrote” refers to the material she wrote, a free relative. “I wonder what she wrote” embeds a question. Both use statement word order, but the meaning and clause type differ.

When can I leave out that?

After many common reporting and thinking verbs, it is often optional: I think (that) the estimate is realistic. Retain it when it makes a long sentence easier to process.

Keep that in an initial subject clause: That the estimate changed surprised us. In ordinary conversation, It surprised us that the estimate changed is often easier to follow.

3. Embed the question without question word order

Direct: Why did the system fail?
Embedded: We need to establish why the system failed.

Use subject + verb inside the embedded clause. Remove question-only do/does/did and put the tense on the main verb.

The outer sentence can be a question

Do you know where the files are?

The outer question uses question order. The embedded part stays in statement order.

A question word can already be the subject

Who authorised it?
We need to know who authorised it.

Who is the subject, so there is no separate subject to move in front of authorised.

Do not backshift mechanically: “I know where she works” describes present knowledge. A past reporting context may call for backshift, but embedding alone does not make a present fact past.

Hear a precise recommendation

Listen to the contrasts. Then listen to the recommendation and identify one fact, one uncertainty and one proposed action.

Amanda reads the models in an American accent. The grammar applies across standard British and American English.

Amanda · English (United States)

Model transcript and listening guidance

That and what: I accept that the method has limitations. I accept what the evidence shows. I value what she wrote. I wonder what she wrote.

Embedded questions: Why did the system fail? We need to establish why the system failed. Do you know where the files are?

A careful recommendation: I accept that the new system is faster. What concerns me is whether it preserves the original files. We should establish why the backup failed before deciding whether to proceed.

Whoever and a heavy clause: Give access to whoever manages the project. It is concerning that the new system cannot preserve the original files.

Listening guidance: Fact: the system is faster. Uncertainty: whether it preserves the original files. Action: establish why the backup failed before deciding whether to proceed.

4. Choose whether when the structure requires it

For a yes/no question after a verb such as ask or wonder, both can work: They asked if/whether the room was available.

Prefer the form that fits the structure
Structure	Correct example
Initial subject clause	Whether we proceed depends on the evidence.
After a preposition	There is disagreement about whether we should proceed.
Before to + verb	We must decide whether to proceed.
Immediately before or not	We must decide whether or not to proceed.

Reduction needs the intended subject: “We must decide whether we should proceed” can become “We must decide whether to proceed.” If we are deciding whether another team should proceed, keep that subject explicit.

Separate uncertainty from a condition

I will check whether the backup works means I will investigate the answer.

I will check the file if the backup works makes checking conditional on the backup working. Choose whether when you need an unambiguous embedded yes/no question.

5. Manage reference, weight and emphasis

Whoever: the person who, or anyone who

Give access to whoever manages the project.

Whoever is the subject of manages inside its own clause. The preposition to applies to the whole phrase.

For difficult formal case choices, a clear paraphrase is often better: Give access to the person responsible for the project.

Move a heavy subject to the end

That the new system cannot preserve the original files is concerning.

It is concerning that the new system cannot preserve the original files.

The second version introduces the evaluation first and saves the longer information for the end. This is extraposition.

Keep the distinction: “I value what you recommended” treats the recommendation as the valued thing. “I value the advice that you gave” has an explicit noun followed by a relative clause. Avoid duplicating the noun: the advice what you gave is not standard written English.

Edit for meaning: identify the main assertion, check what each clause refers to, and split the sentence if readers must hold too much information before reaching the main verb.

Repair and explain

Try each repair aloud or in writing before opening the answer.

Repair: “We must establish why did the trial fail before deciding if to repeat it.”

Check the repair

We must establish why the trial failed before deciding whether to repeat it.

Use statement order inside the embedded question and whether before a to-infinitive.

Rewrite to make the long subject easier to follow: “That several independent teams could not reproduce the result is significant.”

Check the repair

It is significant that several independent teams could not reproduce the result.

Extraposition introduces the evaluation before the longer content clause. The core meaning remains.

Mastery quiz

Choose one answer for each question. Check your answers, read the explanations, then retry any you missed.

1. I accept ___ the initial estimate was inaccurate.whatthatwhether to

2. I will consider ___ you recommend. Meaning: the thing(s) you recommend.thatwhatif

3. Choose the correct embedded question.We need to know why did it happen.We need to know why it happened.We need to know why it did happened.

4. Choose the standard initial subject clause.If to proceed depends on the evidence.Whether we proceed depends on the evidence.That whether proceed depends on the evidence.

5. There is disagreement about ___ we should proceed.whetherthatif to

6. We must decide whether to publish. Who is normally understood to publish?The same group represented by weAn unspecified different team, automaticallyNobody, because publication is impossible

7. Give the key to ___ is supervising today.whomeverwhoeverwhom

8. Which sentence moves the long subject to the end without changing the core evaluation?It is worrying that the data cannot be recovered.The data worry that it cannot be recovered.What worrying is the data.

9. Choose the natural question containing an embedded clause.Do you know where are the files?Do you know where the files are?You know do where the files are?

10. Which contrast is accurate?In I value what she wrote, what she wrote refers to her writing; in I wonder what she wrote, it embeds a question.Every what-clause must be a direct question.That and what are interchangeable in every noun clause.

Full answer key with explanations

that. That introduces the complete proposition after accept.
what. What means the thing(s) that and supplies the object of recommend.
We need to know why it happened.. Why it happened uses subject + verb inside the embedded clause.
Whether we proceed depends on the evidence.. The whether-clause is the subject of depends.
whether. Whether works after the preposition about.
The same group represented by we. The reduced form normally shares its understood subject with the decision-makers here.
whoever. Whoever supplies the subject inside whoever is supervising.
It is worrying that the data cannot be recovered.. It introduces the evaluation; the that-clause supplies the information afterwards.
Do you know where the files are?. The outer question uses do you; the embedded part uses the files are.
In I value what she wrote, what she wrote refers to her writing; in I wonder what she wrote, it embeds a question.. The same surface structure can serve different meanings and clause types.

Put it into practice

Write or say a four-sentence recommendation. Include a that-clause, an embedded wh-question, whether to, and one sentence with a long clause placed at the end.

Self-check: Check clause meaning, statement word order, clear reference and whether + to. Read it aloud once and shorten any sentence that is hard to follow.

Compare with a model

I accept that the proposal could save time. We must establish how the new process protects private information. Then we can decide whether to run a trial. It is essential that the team understands the risks.