Restrictive and Nonrestrictive Clauses: What’s the Difference? (Easy Guide + Examples)

Learning restrictive and nonrestrictive clauses becomes easier when you understand how each clause works in a sentence and improves English grammar.

While studying grammar, I noticed that a restrictive clause is essential because it modifies, modifies the noun, or modifies the noun it belongs to and precedes the noun it explains.

These restrictive clauses identify nouns, limit, and limit nouns in an essential way, so they cannot be removed without changing the sentence meaning and overall meaning.

A nonrestrictive clause is nonessential because it describes a noun or nouns in a nonessential way and simply adds extra information.

If that information is removed, the main sentence still keeps its meaning.

Both relative clauses have different purposes, but knowing whether a clause is restrictive or nonrestrictive helps you write accurate sentences with confidence.

Quick Answer

Restrictive and nonrestrictive clauses are adjective (relative) clauses that describe a noun.

• Restrictive clause: Gives essential information about the noun. It does not use commas.
• Nonrestrictive clause: Gives extra, non-essential information. It uses commas before and after the clause.

Examples:

• Restrictive: The student who studied all night passed the exam.
• Nonrestrictive: Sarah, who studied all night, passed the exam.

What Are Restrictive and Nonrestrictive Clauses?

Restrictive and nonrestrictive clauses are both types of relative clauses (also called adjective clauses). They modify a noun by providing more information.

The difference is whether the information is necessary to identify the noun.

If removing the clause changes the sentence’s meaning or makes it unclear, it is restrictive. If removing the clause still leaves the main meaning intact, it is nonrestrictive.

What Is a Restrictive Clause?

A restrictive clause provides information that is necessary to identify the noun it modifies. Without this information, the sentence loses its intended meaning.

A restrictive clause never uses commas.

Examples

• The books that are on the top shelf belong to me.
• Students who submit their assignments early receive bonus points.
• The dog that barked all night belongs to our neighbor.
• People who exercise regularly often feel healthier.
• I prefer movies that have happy endings.

In each example, the clause identifies exactly which person, book, dog, or movie is being discussed.

What Is a Nonrestrictive Clause?

A nonrestrictive clause adds extra information that is interesting but not essential. The sentence would still make sense without it.

A nonrestrictive clause must be separated by commas.

Examples

• My brother, who lives in Canada, is visiting next month.
• Paris, which attracts millions of tourists every year, is famous for its culture.
• Emma, who loves classical music, plays the piano beautifully.
• My laptop, which I bought last year, still works perfectly.
• The teacher, who has taught for thirty years, retired yesterday.

Removing the highlighted clause does not change which person or object is being discussed.

Restrictive vs. Nonrestrictive Clauses

Feature	Restrictive Clause	Nonrestrictive Clause
Information	Essential	Extra or additional
Commas	No commas	Uses commas
Can it be removed?	No	Yes
Changes meaning if removed?	Yes	No
Purpose	Identifies the noun	Adds interesting details

Easy Comparison

Consider these two sentences:

Restrictive:

The employees who work remotely attend online meetings.

This means only remote employees attend online meetings.

Nonrestrictive:

The employees, who work remotely, attend online meetings.

This suggests all employees work remotely, and the clause simply adds extra information.

The comma completely changes the meaning.

How to Identify Restrictive and Nonrestrictive Clauses

Ask yourself these questions:

Is the information necessary?

If yes, it is restrictive.

Example:

• The car that has a flat tire needs repair.

Without the clause, you don’t know which car.

Is the information only additional?

If yes, it is nonrestrictive.

Example:

• My car, which has a flat tire, needs repair.

You already know which car. The clause simply provides extra information.

Relative Pronouns Used

Both types often begin with relative pronouns.

Restrictive Clauses

Common relative pronouns include:

• who
• whom
• whose
• that
• which

Examples:

• The woman who called earlier is waiting.
• The house that Jack built is famous.
• The laptop which costs less is a better choice.

Nonrestrictive Clauses

Common relative pronouns include:

• who
• whom
• whose
• which

Notice that that is generally not used in nonrestrictive clauses.

Examples:

• My aunt, who lives nearby, visits often.
• The museum, which reopened recently, attracts many visitors.

Common Mistakes

Many learners confuse these clause types. Here are the most common errors.

Using commas with restrictive clauses

❌ The students, who arrived early, received certificates.

✅ The students who arrived early received certificates.

If only some students arrived early, commas should not be used.

Forgetting commas with nonrestrictive clauses

❌ My sister who is a doctor lives in London.

✅ My sister, who is a doctor, lives in London.

The clause simply gives additional information.

Using “that” in nonrestrictive clauses

❌ My phone, that I bought yesterday, is fast.

✅ My phone, which I bought yesterday, is fast.

Removing essential information

Always ask whether the clause identifies the noun before deciding on punctuation.

Tips to Remember

Keep these simple rules in mind:

• Restrictive means the information is necessary.
• Nonrestrictive means the information is optional.
• Restrictive clauses never use commas.
• Nonrestrictive clauses always use commas.
• “That” usually introduces restrictive clauses.
• “Which” commonly introduces nonrestrictive clauses.

More Practice Examples

Restrictive

• The employee who speaks Spanish helped the customer.
• Children who read daily improve their vocabulary.
• The restaurant that serves vegan food is popular.
• Anyone who breaks the rules will be fined.

Nonrestrictive

• My uncle, who retired last year, enjoys traveling.
• The library, which opened in 1920, is a historic building.
• Lucy, who won the competition, thanked her coach.
• Our office, which overlooks the river, has beautiful views.

Restrictive and Nonrestrictive Clauses in Academic Writing

Using these clauses correctly improves clarity and precision.

Academic writers often use restrictive clauses to define specific subjects.

Example:

• Participants who completed the survey were included in the analysis.

Nonrestrictive clauses are useful when adding background information.

Example:

• The survey, which contained twenty questions, took about fifteen minutes to complete.

Proper punctuation helps readers understand whether information is essential or merely additional.

American vs. British English

The grammar rules for restrictive and nonrestrictive clauses are largely the same in both American English and British English.

However, there are slight style differences.

• American English often prefers that in restrictive clauses.
  • The book that I borrowed was excellent.
• British English may use either that or which in restrictive clauses.
  • The book which I borrowed was excellent.

For nonrestrictive clauses, both American and British English generally use which and always set the clause off with commas.

Why Are Restrictive and Nonrestrictive Clauses Important?

Correctly using restrictive and nonrestrictive clauses improves both grammar and communication.

They help readers understand:

• Which person or thing you mean.
• Whether information is essential.
• How punctuation affects meaning.
• Why commas matter in English writing.

Writers who master these clauses produce clearer essays, emails, reports, and articles.

FAQs

What are restrictive and nonrestrictive clauses?

Restrictive clauses provide essential information needed to identify a noun, while nonrestrictive clauses provide extra information that can be removed without changing the sentence’s main meaning.

Do restrictive clauses use commas?

No. Restrictive clauses never use commas because the information is necessary for identifying the noun.

Do nonrestrictive clauses always need commas?

Yes. A nonrestrictive clause should always be enclosed by commas since it adds non-essential information.

Can “that” introduce a nonrestrictive clause?

No. Standard English grammar generally uses which instead of that in nonrestrictive clauses.

How do I know whether a clause is restrictive?

Remove the clause from the sentence. If the meaning changes or the noun becomes unclear, the clause is restrictive.

Which is more common in American English: “that” or “which”?

American English typically prefers that for restrictive clauses and which for nonrestrictive clauses.

Why do commas change the meaning?

Commas signal that the information is extra rather than essential. Without commas, readers assume the clause identifies the noun.

Summary

Understanding restrictive and nonrestrictive clauses makes your writing clearer, more accurate, and easier to read. The key difference is whether the clause provides essential information.

Restrictive clauses identify the noun and never use commas, while nonrestrictive clauses add extra details and must be enclosed with commas.

Whenever you’re unsure, try removing the clause. If the sentence still identifies the noun correctly, the clause is probably nonrestrictive.

If removing it changes the meaning or creates confusion, it’s restrictive. Practicing this simple test will help you use commas correctly and write with greater confidence.

Actionable Takeaway

The next time you edit your writing, check every relative clause. Ask yourself whether the information is essential or merely additional. This quick habit will improve your grammar, punctuation, and overall writing quality.