Adjective Clause: Definition, Types, Examples and Usage in English Grammar

 Have you ever read a sentence that gives extra information about a person or thing without starting a new sentence? That extra information often comes from an adjective clause. For example: The student who won the prize is my friend. In this sentence, ‘who won the prize’ describes the noun student, so it functions as an adjective clause.

In English grammar, adjective clauses are used to make sentences more detailed, natural, and meaningful. In this guide, you will learn the definition of an adjective clause, its rules, types, examples, how to identify adjective clauses, and the differences between noun, adjective, and adverb clauses in a simple and easy-to-understand way.

Table of Contents

• What is an Adjective Clause?
• Forming and Using Adjective Clauses: Key Points to Remember
• Types of Adjective Clauses
• Relative Pronouns Used in Adjective Clauses
• How to Identify an Adjective Clause in a Sentence
• How Adjective Clauses Are Used in Writing
• Difference Between an Adjective, an Adjective Phrase and an Adjective Clause
• Adjective Clause vs Adverbial Clause
• Noun Clause, Adjective Clause and Adverb Clause: What's the Difference?
• Common Mistakes with Adjective Clauses
• Examples of Adjective Clauses
• Adjective Clause Exercises

What is an Adjective Clause?

An adjective clause is a group of words that works like an adjective in a sentence. Just as a single adjective describes a noun, an adjective clause also describes or gives more information about a noun or pronoun, but it does so using an entire clause, which has its own subject and verb.

Adjective clauses are also called relative clauses or adjectival clauses, and they almost always begin with a relative pronoun such as who, whom, whose, which, or that.

For example, The girl who sits next to me is my best friend. Here, who sits next to me is the adjective clause. It tells us more about the noun girl.

Adjective Clause Definition

An adjective clause is a type of subordinate clause (dependent) that modifies a noun or pronoun and cannot stand alone as a complete sentence. It must be connected to an independent clause to form a grammatically correct sentence.

Forming and Using Adjective Clauses: Key Points to Remember

Here are the most important rules to keep in mind when forming and using an adjective clause:

• It must contain a subject and a verb: Every clause, including an adjective clause has its own subject and verb. For example: The book that I borrowed from the library is very interesting. Here the subject is I and verb is borrowed. 

• It usually begins with a relative pronoun: Mostly the adjective clauses begings with relative pronouns. Some of them are who, whom, whose, which, and that. 

• It comes immediately after the noun it modifies: Unlike a simple adjective that comes before a noun, an adjective clause always follows the noun it describes. For examples, The teacher who teaches us chemistry is very experienced.

• It is a dependent clause: An adjective clause cannot be a sentence on its own. It must be attached to a main claue (independent clause).

• The relative pronoun can sometimes be omitted: When the relative pronoun acts as the object (not the subject) of the adjective clause, it can be omitted.

 

Types of Adjective Clauses

There are mainly two types of adjective clauses.

Restrictive Adjective Clause

A restrictive adjective clause gives essential information about the noun. Without it, the meaning becomes unclear.

Examples:

• The boy who won the race is my cousin.

• Books that contain maps are useful.

Here, the clauses identify exactly which boy or books we are talking about.

Non-Restrictive Adjective Clause

A non-restrictive adjective clause gives extra information. It is separated by commas.

Examples:

• My uncle, who lives in Chennai, is a doctor.

• The Taj Mahal, which attracts millions of tourists, is in India.

The sentence still makes sense even if the clause is removed.

 

Relative Pronouns Used in Adjective Clauses

Relative pronouns are the connecting words that introduce adjective clauses. Each pronoun has a specific use:

 

How to Identify an Adjective Clause in a Sentence

Many of us often find it tricky to identify an adjective clause. Here is a simple step-by-step method:

Step 1: Look for a relative pronoun (who, whom, whose, which, or that) in the sentence.

Step 2: Find the group of words that begins with the relative pronoun and contains a subject and a verb.

Step 3: Ask yourself: Does this group of words describe a noun or pronoun in the sentence?

Step 4: If the answer is yes, it is an adjective clause.

Step 5: Identify which noun it modifies. The adjective clause usually appears directly after that noun.

Example: The scientist who discovered penicillin changed medicine forever.

• Relative pronoun: who

• Clause: who discovered penicillin (subject: who, verb: discovered)

• Noun it modifies: scientist

Therefore, who discovered penicillin is an adjective clause.

 

How Adjective Clauses Are Used in Writing

Adjective clauses are widely used in both formal and informal writing. They help writers:

• combine ideas smoothly

• avoid repetition

• add details

• make sentences more interesting

• improve sentence variety

By using adjective clauses, writers can connect information naturally and create clearer, more engaging sentences.

 

Difference Between an Adjective, an Adjective Phrase, and an Adjective Clause

Adjectives, adjective phrases, and adjective clauses are all modifiers that describe nouns, but they do so in different ways. The table below shows the differences between them. 

 

Adjective Clause vs Adverbial Clause

Confusion between adjective clauses and adverbial clauses are common because both are dependent clauses. However, they have different functions in a sentence.

 

Noun Clause, Adjective Clause and Adverb Clause: What's the Difference?

These are the three main types of dependent clauses in English grammar. Each clause has a different function in a sentence.

 

Common Mistakes with Adjective Clauses

Mistake 1: Using a comma with a restrictive clause

Incorrect: The student, who scored the highest, was awarded.

Correct: The student who scored the highest was awarded.

Mistake 2: Placing the adjective clause away from the noun it modifies

Incorrect: The dog bit the boy that was very aggressive.

Correct: The dog that was very aggressive bit the boy.

Mistake 3: Using "who" instead of "whom" for objects

Incorrect: The person who I spoke to was helpful.

Correct: The person whom I spoke to was helpful. (formal writing)

Mistake 4: Removing the relative pronoun when it is the subject

Incorrect: The teacher was absent gave us homework.

Correct: The teacher who was absent gave us homework.

Examples of Adjective Clauses

Here are some adjective clause examples for better understanding.

• The student who answered correctly received a prize.

• I know the girl whose father is a pilot.

• This is the place where we first met.

• The movie that we watched yesterday was exciting.

• People who exercise regularly stay healthy.

• The teacher whom the students respected retired last year.

• I remember the day when we visited Jaipur.

• The bicycle that belongs to Ravi is new.

• The author whose novel became famous won an award.

• The restaurant where we ate dinner was crowded.

 

Adjective Clause Exercises

Exercise 1: Identify the Adjective Clause

Underline the adjective clause in each sentence and write the noun it modifies.

1. The laptop that I ordered online arrived yesterday.

2. My neighbour, who is a retired army officer, is very disciplined.

3. The era when there was no internet seems unimaginable now.

4. I met a girl whose father is a famous musician.

5. The novel which she recommended is out of stock.

Answers:

1. The laptop that I ordered online arrived yesterday.

2. My neighbour, who is a retired army officer, is very disciplined.

3. The era when there was no internet seems unimaginable now.

4. I met a girl whose father is a famous musician.

5. The novel which she recommended is out of stock.

Exercise 2: Fill in the Blanks

Choose the correct relative pronoun.

1. The boy _____ scored the goal is my brother.

2. The house _____ roof is painted red looks beautiful.

3. This is the park _____ children play every evening.

4. The teacher _____ teaches science is absent today.

5. I remember the year _____ we moved to Bangalore.

Answers:

1. who

2. whose

3. where

4. who

5. when