Grammar Made Simple

Noun Clauses

Using a whole idea as a single word — as the subject, object, or complement.

I know what you did last summer.

What Is a Noun Clause?

It sounds complicated — but you use these all the time without realising it.

A group of words that acts like a single noun inside a sentence. Instead of using a simple word like "it" or "something", you use a whole mini-sentence. It always starts with a connector word like that, what, who, whether, if, how, or a question word.

💡 Think of it as putting an entire thought into a box — and then using that box as a single word in your sentence.

With a simple noun

"I know the answer."

Works — but limited.

With a noun clause

"I know what the answer is."

✓ A whole idea used as a noun!

Exercise 1

Find the Noun Clause

Click every word that belongs to the noun clause, then press Check.

Sentence 1 of 5

Click all the words in the noun clause (including the connector word).

Sentence 2 of 5

Click all the words in the noun clause (including the connector word).

Sentence 3 of 5

Click all the words in the noun clause (including the connector word).

Sentence 4 of 5

Click all the words in the noun clause (including the connector word).

Sentence 5 of 5

Click all the words in the noun clause (including the connector word).

What Can a Noun Clause Do?

Just like a regular noun, it can play four different roles in a sentence.

Subject

The noun clause is the "doer" — it comes at the start.

What she said surprised everyone.

Object

The noun clause receives the action of the verb.

She told me that she was leaving.

Complement

It comes after be and completes the meaning.

The problem is that nobody listened.

After a preposition

It follows a preposition like about, of, in.

I'm not sure about what you mean.

Exercise 2

What Job Does the Clause Do?

The underlined part is a noun clause. What role does it play in the sentence?

Question 1 of 4

What she said surprised everyone.

Question 2 of 4

She told me that she was leaving.

Question 3 of 4

The problem is that nobody listened.

Question 4 of 4

I'm not sure about what you mean.

The Connector Words

The connector word you choose depends on whether you're reporting a statement, a yes/no question, or a question word question.

📢 Reporting statements

that

"She said that she was tired."
(Often "that" can be left out in speech)

❓ Yes / No questions

if · whether

"I don't know if he's coming."
"Ask her whether she wants tea."

🔍 Question words

what · who · where · when · why · how

"Tell me where you found it."

⚠️ Word order warning

Statement order — not question order!

❌ "I know where is he."
✓ "I know where he is."

🔑 Key rule: Inside a noun clause, use statement word order — subject first, then verb. Never flip them like in a question.

Exercise 3

Choose the Right Connector

Word Bank: that · what · whether · where · why · how

Question 1 of 5

I don't understand __________ she is so upset. (reason)

Question 2 of 5

She told me __________ the meeting had been cancelled. (reporting a fact)

Question 3 of 5

I have no idea __________ he put my keys. (place)

Question 4 of 5

Do you know __________ the film has started yet? (yes/no question)

Question 5 of 5

__________ you feel about this matters a lot to me. (subject of the sentence)

Exercise 4

Fix the Word Order

These sentences have question word order inside the noun clause — which is wrong! Rewrite each one correctly.

Question 1 of 4

❌ Incorrect: "I wonder where is she going."

Question 2 of 4

❌ Incorrect: "Can you tell me what time is it?"

Question 3 of 4

❌ Incorrect: "Nobody knows why did he leave."

Question 4 of 4

❌ Incorrect: "She asked me how old am I."

Starting a Sentence with "It"

Sometimes a noun clause is really the subject of the sentence — but starting with a long clause sounds heavy. English often moves it to the end and puts a small placeholder word, it, at the front instead.

When a noun clause would make an awkward subject, move it to the end of the sentence and start with it instead. The meaning doesn't change — only the order.

Clause first (heavy)

"That she passed the exam surprised nobody."

Correct, but sounds stiff.

With "it" (natural)

"It surprised nobody that she passed the exam."

✓ Much more natural!

💡 Think of "it" as holding the subject's place at the front of the queue while the real subject — the noun clause — waits at the back.

🔑 Key rule: It + be/verb + (adjective) + that-clause. "That" can often be dropped in speech: "It's clear (that) he's tired."

Exercise 5

Move the Clause: Starting with "It"

Choose the option that uses the placeholder "it" correctly.

Question 1 of 4

__________ surprised nobody that she passed the exam.

Question 2 of 4

Which is the natural way to say: "That he is tired is clear"?

Question 3 of 4

__________ is a pity that the shop is closed.

Question 4 of 4

It is obvious __________ she is angry.

Giving Strong Advice: the Base-Form Rule

After certain verbs and phrases that give strong advice, orders, or urgent opinions, the verb inside the clause behaves in a special way.

After words like suggest, recommend, insist, demand, propose — or phrases like it's important / essential / vital that — the verb inside the clause stays in its plain base form (no -s, no past tense, no "to"), no matter who or what the subject is.

A normal fact

"I know that he arrives on time."

Regular verb form — matches the subject.

Strong advice

"I suggest that he arrive on time."

✓ Base form — never "arrives" or "arrived".

💡 It doesn't matter if the subject is "he", "she" or "it" — the verb never changes. Even "be" stays in its plain form: "It's essential that she be on time," not "is".

🔑 Key rule: Strong-advice word/phrase + subject + base-form verb. For negatives, put "not" before the base form: "It's essential that she not be late."

Exercise 6

Strong Advice: Base Form

After words like suggest, insist, and phrases like "it is essential that", the verb stays in its base form.

Question 1 of 4

I suggest that he __________ on time.

Question 2 of 4

It is essential that she __________ late.

Question 3 of 4

The manager insisted that every employee __________ the form.

Question 4 of 4

I know that he usually __________ on time. (a normal fact)

Exercise 7

Mixed Review

A mix of everything — reporting facts, sentences with "it", strong advice, yes/no questions, and question words.

That-Clauses

Question 1 of 16

The report confirmed __________ the company had made a profit.

Question 2 of 16

Everyone agrees __________ the plan needs more work.

Question 3 of 16

She admitted __________ she had forgotten the appointment.

Sentences with "It"

Question 4 of 16

__________ doesn't matter what people think of you.

Question 5 of 16

I found __________ strange that he didn't call.

Question 6 of 16

__________ is essential that everyone arrives on time.

Strong Advice (Base Form)

Question 7 of 16

The doctor recommended that she __________ more water.

Question 8 of 16

It is essential that he __________ present at the meeting.

Question 9 of 16

I suggest that Tom __________ his manager before leaving early.

Question 10 of 16

The teacher insists that all students __________ their homework on time.

If / Whether Clauses

Question 11 of 16

I wonder __________ she remembers me.

Question 12 of 16

He asked __________ or not the train had left.

Question 13 of 16

Could you tell me __________ this seat is taken?

Question-Word Clauses

Question 14 of 16

I don't know __________ she lives now.

Question 15 of 16

Can you explain __________ this machine works?

Question 16 of 16

Nobody understands __________ he quit his job so suddenly.

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Well done!

You completed all the exercises.