Noun Clauses: Definition, Functions, and Example Sentences

A noun clause is a dependent clause that functions as a noun. It can act as a subject, an object, or a complement in a sentence. Noun clauses always follow statement word order (subject + verb), even when they begin with question words.

Noun Clauses

Basic structure: Subordinator + Subject + Verb

Examples:

She explained why the meeting was canceled.
What he decided remains unclear.
I’m curious about how they solved the problem.
Whatever you choose will be fine.
We discussed whether the plan would work.

Functions of Noun Clauses

Function	Example
Subject	Whether she will accept the offer is uncertain.
Direct Object	They finally understood what the instructions meant.
Indirect Object	She showed us how the system works.
Object of a Preposition	He is responsible for what happens next.
Subject Complement	The truth is that nobody warned us.

Types of Noun Clauses

That-Clauses

That the train was delayed annoyed many passengers.
She believes that hard work pays off.
The main concern is that costs are increasing.

Wh-Clauses

How he solved the puzzle impressed the teacher.
No one knows where the keys were left.
We couldn’t explain why the system failed.

Whether / If Clauses

Whether the package arrives today depends on the weather.
I’m not sure if this method is effective.
They argued about whether they should postpone the trip.

Noun Clause vs. Relative Clause

Clause Type	Function	Example
Noun Clause	Acts as a noun	She remembers what he promised.
Relative Clause	Modifies a noun	She remembers the promise that he made.

Common Mistakes with Noun Clauses

Mistake 1: Using Question Word Order

❌ I don’t understand why did she leave.
✅ I don’t understand why she left.

Mistake 2: Confusing Noun Clauses with Relative Clauses

❌ We visited the city where we first met. (relative clause)
✅ We visited where we first met. (noun clause)

Mistake 3: Focusing on the Wrong Subordinator

❌ Object noun clauses must use only that or if.
✅ Many wh-words can function as objects depending on meaning.

Mistake 4: Using a Noun Clause as a Complete Sentence

❌ Whether we should continue.
✅ Whether we should continue is still under discussion.

Last Updated on January 22, 2026