Mastering Relative Clauses: Definition, Types, and Usage

Relative clauses are essential for adding depth and complexity to your English sentences. They allow you to provide additional information about nouns and pronouns, making your writing more precise and engaging.

Understanding how to use relative clauses correctly is crucial for both written and spoken English. This comprehensive guide will cover everything you need to know, from basic definitions to advanced usage, with plenty of examples and practice exercises to help you master this important grammatical concept.

Whether you’re a beginner or an advanced learner, this article will provide valuable insights and practical skills to improve your English proficiency.

This article is designed for English language learners of all levels, teachers looking for comprehensive teaching materials, and anyone who wants to improve their understanding and use of English grammar. By the end of this guide, you’ll be able to identify, construct, and use relative clauses confidently and accurately.

Table of Contents

1. Definition of Relative Clauses
2. Structural Breakdown of Relative Clauses
3. Types of Relative Clauses
   • Defining Relative Clauses (Restrictive)
   • Non-Defining Relative Clauses (Non-Restrictive)
   • Contact Relative Clauses
   • Relative Clauses with Quantifiers
4. Relative Pronouns and Adverbs
   • Who and Whom
   • Which
   • That
   • Whose
   • Where
   • When
   • Why
5. Examples of Relative Clauses
   • Defining Relative Clause Examples
   • Non-Defining Relative Clause Examples
   • Relative Clauses with Prepositions
   • Relative Clauses with Quantifiers Examples
6. Usage Rules for Relative Clauses
   • Punctuation Rules
   • Choosing the Correct Pronoun
   • Omitting Relative Pronouns
7. Common Mistakes with Relative Clauses
8. Practice Exercises
   • Exercise 1: Identifying Relative Clauses
   • Exercise 2: Combining Sentences with Relative Clauses
   • Exercise 3: Correcting Errors in Relative Clauses
9. Advanced Topics in Relative Clauses
   • Reduced Relative Clauses
   • Embedded Relative Clauses
10. Frequently Asked Questions (FAQ)
11. Conclusion

Definition of Relative Clauses

A relative clause is a type of subordinate clause that modifies a noun or pronoun in the main clause. It provides additional information about the noun or pronoun, helping to identify or describe it more fully. Relative clauses typically begin with a relative pronoun (who, whom, which, that, whose) or a relative adverb (where, when, why). Understanding the function and structure of relative clauses is essential for constructing complex and nuanced sentences in English.

Relative clauses function as adjectives, adding descriptive details to the nouns they modify. They are dependent clauses, meaning they cannot stand alone as a complete sentence. Instead, they rely on the main clause for their meaning. The noun or pronoun that the relative clause modifies is called the antecedent.

Consider the following examples:

• The book that I borrowed from the library is very interesting. (The relative clause modifies “the book.”)
• The woman who lives next door is a doctor. (The relative clause modifies “the woman.”)
• This is the house where I grew up. (The relative clause modifies “the house.”)

Structural Breakdown of Relative Clauses

The basic structure of a relative clause includes a relative pronoun or adverb followed by a subject and a verb. However, the subject may be omitted if the relative pronoun is the subject of the clause. The relative clause is embedded within the main clause, directly following the noun or pronoun it modifies.

Here’s a breakdown of the structural elements:

1. Antecedent: The noun or pronoun that the relative clause modifies.
2. Relative Pronoun/Adverb: who, whom, which, that, whose, where, when, why.
3. Subject (Optional): The subject of the relative clause (may be omitted if the relative pronoun is the subject).
4. Verb: The verb of the relative clause.
5. Additional Information: Any additional words or phrases that complete the relative clause.

Let’s look at some examples with structural annotations:

• The man who (Relative Pronoun) is (Verb) standing over there (Additional Information) is my brother. (Antecedent: The man)
• The car that (Relative Pronoun) I (Subject) bought (Verb) last week (Additional Information) is very reliable. (Antecedent: The car)
• The city where (Relative Adverb) I (Subject) was born (Verb) is beautiful. (Antecedent: The city)

Types of Relative Clauses

Relative clauses can be divided into two main types: defining (restrictive) relative clauses and non-defining (non-restrictive) relative clauses. Understanding the difference between these types is crucial for using relative clauses correctly and effectively.

Defining Relative Clauses (Restrictive)

Defining relative clauses are essential to the meaning of the sentence. They provide information that is necessary to identify the noun or pronoun being modified. Without the defining relative clause, the meaning of the sentence would be incomplete or unclear. Defining relative clauses are not set off by commas.

For example:

• The book that I borrowed from the library is very interesting. (This clause specifies which book we are talking about.)
• The student who studies hard will succeed. (This clause identifies which student will succeed.)

Non-Defining Relative Clauses (Non-Restrictive)

Non-defining relative clauses provide additional, non-essential information about the noun or pronoun being modified. This information is interesting but not necessary to identify the noun or pronoun. The sentence would still make sense without the non-defining relative clause. Non-defining relative clauses are always set off by commas.

For example:

• My sister, who lives in London, is a doctor. (We already know who “my sister” is; the clause just adds extra information.)
• Paris, which is the capital of France, is a beautiful city. (We already know what “Paris” is; the clause just adds extra information.)

Contact Relative Clauses

A contact relative clause (also known as a zero relative clause) is a defining relative clause where the relative pronoun (who, whom, which, or that) is omitted. This omission is possible when the relative pronoun is not the subject of the relative clause. Contact clauses are more common in informal English.

For example:

• The book I borrowed from the library is very interesting. (that is omitted)
• The person I saw yesterday was very kind. (whom or that is omitted)

Relative Clauses with Quantifiers

Relative clauses can also be used with quantifiers such as all of, some of, most of, none of, many of, and few of. These quantifiers are followed by whom or which, depending on whether the antecedent is a person or a thing. These clauses are typically non-defining and set off by commas.

For example:

• I have three sisters, all of whom are teachers.
• He wrote several books, most of which were bestsellers.

Relative Pronouns and Adverbs

The choice of relative pronoun or adverb depends on the function of the relative clause and the nature of the antecedent. Here’s a breakdown of the most common relative pronouns and adverbs:

Who and Whom

Who is used to refer to people when the relative pronoun is the subject of the relative clause. Whom is used to refer to people when the relative pronoun is the object of the verb or the object of a preposition in the relative clause. In modern English, who is often used in place of whom, especially in informal contexts.

Examples:

• The woman who is speaking is my professor. (who is the subject of “is speaking”)
• The man whom I saw yesterday is my neighbor. (whom is the object of “saw”)
• The man who I saw yesterday is my neighbor. (who is used instead of whom in informal context)
• The candidate to whom the award was given is very talented. (whom is the object of the preposition “to”)

Which

Which is used to refer to things or animals. It can be used in both defining and non-defining relative clauses.

Examples:

• The car which I bought last week is very reliable.
• My house, which is over 100 years old, needs some repairs.

That

That is used to refer to people, things, or animals. It is primarily used in defining relative clauses. That is often used as an alternative to who or which in informal English.

Examples:

• The book that I borrowed from the library is very interesting.
• The man that I saw yesterday is my neighbor.

Whose

Whose is used to show possession. It can refer to both people and things.

Examples:

• The woman whose car was stolen is very upset.
• The company whose profits have increased is expanding.

Where

Where is used to refer to places.

Examples:

• The city where I grew up is very beautiful.
• This is the restaurant where we first met.

When

When is used to refer to times or occasions.

Examples:

• I remember the day when I first met her.
• The year when the Berlin Wall fell was a turning point in history.

Why

Why is used to refer to reasons.

Examples:

• I don’t know the reason why she left.
• That’s the reason why I’m so happy.

Examples of Relative Clauses

To further illustrate the use of relative clauses, here are several examples organized by type and function:

Defining Relative Clause Examples

The following table provides examples of defining relative clauses, highlighting their role in identifying the noun or pronoun they modify. Note that these clauses are not set off by commas.

Sentence	Relative Clause	Antecedent
The book that I ordered arrived today.	that I ordered	The book
The person who called was very polite.	who called	The person
The car which needs repairs is in the garage.	which needs repairs	The car
The student that studies hard usually succeeds.	that studies hard	The student
The house where I live is very old.	where I live	The house
The reason why I am late is traffic.	why I am late	The reason
The time when the meeting starts is 9 AM.	when the meeting starts	The time
The dog that is barking belongs to my neighbor.	that is barking	The dog
The movie which won the award was excellent.	which won the award	The movie
The teacher who teaches math is very helpful.	who teaches math	The teacher
The phone that I bought yesterday is already broken.	that I bought yesterday	The phone
The restaurant where they serve sushi is my favorite.	where they serve sushi	The restaurant
The song that is playing on the radio is catchy.	that is playing on the radio	The song
The man who fixed my car was very skilled.	who fixed my car	The man
The problem that we need to solve is complex.	that we need to solve	The problem
The solution that he proposed was innovative.	that he proposed	The solution
The website which provides free courses is very useful.	which provides free courses	The website
The exercise that helps build strength is weightlifting.	that helps build strength	The exercise
The idea that she suggested was brilliant.	that she suggested	The idea
The tool that is required for the job is a screwdriver.	that is required for the job	The tool
The game that they are playing looks fun.	that they are playing	The game
The project that they are working on is due next week.	that they are working on	The project
The country where I want to travel is Japan.	where I want to travel	The country
The reason why he is happy is because he got a promotion.	why he is happy	The reason
The food that he cooked was delicious.	that he cooked	The food
The place where they met for the first time was a park.	where they met for the first time	The place
The woman who is wearing a red dress is my boss.	who is wearing a red dress	The woman
The animal that is running in the field is a horse.	that is running in the field	The animal
The lesson that I learned today was very important.	that I learned today	The lesson
The event that they are planning is a charity gala.	that they are planning	The event

Non-Defining Relative Clause Examples

The following table provides examples of non-defining relative clauses, which add extra information but are not essential for identifying the noun or pronoun. These clauses are set off by commas.

Sentence	Relative Clause	Antecedent
My mother, who is a teacher, is very patient.	who is a teacher	My mother
Paris, which is the capital of France, is a beautiful city.	which is the capital of France	Paris
My car, which I bought last year, is very reliable.	which I bought last year	My car
John, who is my best friend, is moving to New York.	who is my best friend	John
The Eiffel Tower, which is a famous landmark, is in Paris.	which is a famous landmark	The Eiffel Tower
My dog, who loves to play fetch, is very energetic.	who loves to play fetch	My dog
London, where I used to live, is a vibrant city.	where I used to live	London
Christmas, when families gather together, is a special time.	when families gather together	Christmas
My birthday, which is in July, is always a fun celebration.	which is in July	My birthday
The museum, which houses many ancient artifacts, is worth visiting.	which houses many ancient artifacts	The museum
My sister, who is a doctor, works at the local hospital.	who is a doctor	My sister
Rome, which is known for its historical sites, attracts many tourists.	which is known for its historical sites	Rome
The book, which I found at the library, is a great read.	which I found at the library	The book
My neighbor, who is a retired engineer, is very knowledgeable.	who is a retired engineer	My neighbor
The concert, which was held outdoors, was a huge success.	which was held outdoors	The concert
My favorite restaurant, which serves Italian cuisine, is always crowded.	which serves Italian cuisine	My favorite restaurant
The project, which was completed ahead of schedule, exceeded expectations.	which was completed ahead of schedule	The project
My parents, who are celebrating their anniversary, are planning a trip.	who are celebrating their anniversary	My parents
The conference, which was attended by experts from around the world, was very informative.	which was attended by experts from around the world	The conference
My cat, who loves to nap in the sun, is very lazy.	who loves to nap in the sun	My cat
The movie, which was directed by a famous filmmaker, received rave reviews.	which was directed by a famous filmmaker	The movie
My uncle, who is a professional photographer, takes stunning pictures.	who is a professional photographer	My uncle
The garden, which is full of colorful flowers, attracts many bees.	which is full of colorful flowers	The garden
The game, which is very challenging, requires a lot of strategy.	which is very challenging	The game
My phone, which has a long battery life, is very convenient.	which has a long battery life	My phone
The bridge, which was built in the 19th century, is an architectural marvel.	which was built in the 19th century	The bridge
My watch, which I received as a gift, is very valuable to me.	which I received as a gift	My watch
The park, which has several walking trails, is a great place to exercise.	which has several walking trails	The park
My computer, which I use for work and entertainment, is essential to me.	which I use for work and entertainment	My computer
The painting, which was created by a renowned artist, is displayed in the gallery.	which was created by a renowned artist	The painting

Relative Clauses with Prepositions

Relative clauses can also include prepositions. The preposition can come before the relative pronoun (more formal) or at the end of the relative clause (more common in informal English).

Sentence	Relative Clause	Antecedent
The person to whom I spoke was very helpful. (Formal)	to whom I spoke	The person
The person who I spoke to was very helpful. (Informal)	who I spoke to	The person
This is the house in which I grew up. (Formal)	in which I grew up	The house
This is the house that I grew up in. (Informal)	that I grew up in	The house
The project on which we are working is very challenging. (Formal)	on which we are working	The project
The project that we are working on is very challenging. (Informal)	that we are working on	The project
The topic about which we are learning is interesting. (Formal)	about which we are learning	The topic
The topic that we are learning about is interesting. (Informal)	that we are learning about	The topic
The company for which he works is very successful. (Formal)	for which he works	The company
The company that he works for is very successful. (Informal)	that he works for	The company
The chair on which she was sitting broke. (Formal)	on which she was sitting	The chair
The chair that she was sitting on broke. (Informal)	that she was sitting on	The chair
The problem with which we are dealing is complex. (Formal)	with which we are dealing	The problem
The problem that we are dealing with is complex. (Informal)	that we are dealing with	The problem
The tool with which he fixed the car was very useful. (Formal)	with which he fixed the car	The tool
The tool that he fixed the car with was very useful. (Informal)	that he fixed the car with	The tool
The situation in which they found themselves was difficult. (Formal)	in which they found themselves	The situation
The situation that they found themselves in was difficult. (Informal)	that they found themselves in	The situation
The movie about which everyone is talking is a must-see. (Formal)	about which everyone is talking	The movie
The movie that everyone is talking about is a must-see. (Informal)	that everyone is talking about	The movie
The book from which I learned a lot was very informative. (Formal)	from which I learned a lot	The book
The book that I learned a lot from was very informative. (Informal)	that I learned a lot from	The book
The reason for which he was fired was not clear. (Formal)	for which he was fired	The reason
The reason that he was fired for was not clear. (Informal)	that he was fired for	The reason
The method by which they solved the problem was ingenious. (Formal)	by which they solved the problem	The method
The method that they solved the problem by was ingenious. (Informal)	that they solved the problem by	The method

Relative Clauses with Quantifiers Examples

The following examples contain relative clauses with quantifiers. These clauses often provide additional information about a group of people or things.

They are usually non-defining and set off by commas.

Sentence	Relative Clause	Antecedent
I invited ten friends, all of whom came to the party.	all of whom came to the party	ten friends
He wrote several books, most of which were bestsellers.	most of which were bestsellers	several books
I have two brothers, both of whom are engineers.	both of whom are engineers	two brothers
She baked many cookies, some of which were burnt.	some of which were burnt	many cookies
They asked several questions, none of which I could answer.	none of which I could answer	several questions
I have read many novels, a few of which I didn’t enjoy.	a few of which I didn’t enjoy	many novels
We visited many countries, each of which had unique attractions.	each of which had unique attractions	many countries
She has many pets, several of which are cats.	several of which are cats	many pets
They conducted numerous experiments, many of which failed.	many of which failed	numerous experiments
I bought several souvenirs, some of which I will give as gifts.	some of which I will give as gifts	several souvenirs
He has written several poems, most of which are about nature.	most of which are about nature	several poems
I have many friends, some of whom live abroad.	some of whom live abroad	many friends
They presented several options, none of which seemed suitable.	none of which seemed suitable	several options
We watched several movies, all of which were entertaining.	all of which were entertaining	several movies
She prepared several dishes, most of which were delicious.	most of which were delicious	several dishes
They explored several caves, some of which were very deep.	some of which were very deep	several caves
I have several siblings, all of whom are married.	all of whom are married	several siblings
He collected several stamps, many of which are very rare.	many of which are very rare	several stamps
I attended several lectures, some of which were boring.	some of which were boring	several lectures
They visited several museums, most of which were impressive.	most of which were impressive	several museums
She planted several trees, all of which are growing well.	all of which are growing well	several trees
I have several hobbies, some of which are quite unusual.	some of which are quite unusual	several hobbies
They offered several solutions, none of which seemed practical.	none of which seemed practical	several solutions
We tried several restaurants, most of which were expensive.	most of which were expensive	several restaurants
She completed several projects, all of which were successful.	all of which were successful	several projects
They read several books, some of which were very long.	some of which were very long	several books
I have several pets, most of which are well-behaved.	most of which are well-behaved	several pets
He visited several cities, all of which were fascinating.	all of which were fascinating	several cities
She solved several problems, many of which were very difficult.	many of which were very difficult	several problems

Usage Rules for Relative Clauses

Proper usage of relative clauses involves understanding punctuation rules, pronoun choices, and when pronouns can be omitted.

Punctuation Rules

The most important punctuation rule for relative clauses is the use of commas. Non-defining relative clauses are always set off by commas, while defining relative clauses are never set off by commas. This distinction is crucial for conveying the intended meaning of the sentence.

Examples:

• My sister, who lives in London, is a doctor. (Non-defining – commas are used)
• The student who studies hard will succeed. (Defining – no commas are used)

Choosing the Correct Pronoun

Selecting the correct relative pronoun depends on the antecedent and the role of the pronoun within the relative clause. Use who or whom for people, which for things, that for both people and things (in

defining relative clauses), and whose for possession. Consider the function of the pronoun in the relative clause (subject, object, or possessive) to make the right choice.

Examples:

• The man who helped me was very kind. (who as the subject)
• The book which I borrowed is overdue. (which as the object)
• The author whose book I read is famous. (whose for possession)

Omitting Relative Pronouns

In defining relative clauses, the relative pronoun can be omitted when it is the object of the verb in the relative clause. This is common in informal English and makes sentences more concise.

Examples:

• The book I borrowed from the library is very interesting. (that is omitted – The book that I borrowed from the library is very interesting.)
• The person I saw yesterday was very kind. (whom or that is omitted – The person whom/that I saw yesterday was very kind.)

However, the relative pronoun cannot be omitted when it is the subject of the relative clause or when a preposition precedes it.

Examples:

• Incorrect: The woman is speaking is my professor. (who cannot be omitted because it is the subject)
• Correct: The woman who is speaking is my professor.
• Incorrect: This is the house I grew up in. (which/that can be omitted only when the preposition is at the end)
• Correct: This is the house in which I grew up.
• Correct: This is the house that I grew up in.

Common Mistakes with Relative Clauses

Using relative clauses correctly can be challenging, and learners often make common mistakes. Here are some frequent errors to avoid:

• Incorrect Punctuation: Forgetting to use commas with non-defining relative clauses or incorrectly using them with defining relative clauses.
• Incorrect: My sister who lives in London is a doctor.
• Correct: My sister, who lives in London, is a doctor.
• Incorrect Pronoun Choice: Using the wrong relative pronoun (e.g., who for things or which for people).
• Incorrect: The book who I borrowed is interesting.
• Correct: The book which I borrowed is interesting.
• Unnecessary Pronoun Omission: Omitting the relative pronoun when it is the subject of the relative clause.
• Incorrect: The man is speaking is my professor.
• Correct: The man who is speaking is my professor.
• Incorrect Preposition Usage: Misplacing or omitting prepositions in relative clauses.
• Incorrect: The house I grew up is beautiful.
• Correct: The house where I grew up is beautiful.
• Correct: The house that I grew up in is beautiful.
• Confusing Defining and Non-Defining Clauses: Misunderstanding the difference between defining and non-defining relative clauses, leading to incorrect comma usage.
• Incorrect: The book, that I borrowed from the library, is very interesting. (If it specifies which book, no commas)
• Correct: The book that I borrowed from the library is very interesting. (Defining)

Practice Exercises

To reinforce your understanding of relative clauses, try the following exercises:

Exercise 1: Identifying Relative Clauses

Identify the relative clause in each sentence and determine whether it is defining or non-defining.

1. The car that I want to buy is very expensive.
2. My friend, who is a talented artist, is having an exhibition.
3. The city where I was born is known for its history.
4. The book which I borrowed from the library is overdue.
5. My teacher, who is very knowledgeable, always helps me.

Answers:

1. that I want to buy (Defining)
2. who is a talented artist (Non-defining)
3. where I was born (Defining)
4. which I borrowed from the library (Defining)
5. who is very knowledgeable (Non-defining)

Exercise 2: Combining Sentences with Relative Clauses

Combine the following pairs of sentences using a relative clause.

1. I met a man. He is a doctor.
2. I bought a car. It is very reliable.
3. I visited a city. I was born there.
4. I read a book. It was very interesting.
5. I have a friend. She lives in New York.

Answers:

1. I met a man who is a doctor.
2. I bought a car that is very reliable.
3. I visited a city where I was born.
4. I read a book which was very interesting.
5. I have a friend who lives in New York.

Exercise 3: Correcting Errors in Relative Clauses

Identify and correct the errors in the following sentences.

1. The book, who I borrowed from you, is great.
2. My sister who lives in Paris, is a teacher.
3. The car that I bought it is very fast.
4. The reason why I am late, is because of the traffic.
5. The person which helped me was very kind.

Answers:

1. The book that I borrowed from you is great.
2. My sister, who lives in Paris, is a teacher.
3. The car that I bought is very fast.
4. The reason why I am late is because of the traffic.
5. The person who helped me was very kind.

Advanced Topics in Relative Clauses

For advanced learners, understanding reduced relative clauses and embedded relative clauses can further enhance your English proficiency.

Reduced Relative Clauses

A reduced relative clause is a relative clause that has been shortened, typically by omitting the relative pronoun and auxiliary verb. This is possible when the relative pronoun is followed by a verb in the active or passive voice.

Examples:

• The book that is written by a famous author is a bestseller. (Full relative clause)
• The book written by a famous author is a bestseller. (Reduced relative clause)
• The students who are studying are doing well. (Full relative clause)
• The students studying are doing well. (Reduced relative clause)

Embedded Relative Clauses

An embedded relative clause is a relative clause that is nested within another relative clause or another clause element. These can create complex and layered sentences.

Examples:

• The book that I borrowed from the library that my friend recommended is very interesting. (Embedded relative clause: “that my friend recommended” is embedded within “that I borrowed from the library”)
• The man who lives next door who is a doctor is very kind. (Embedded relative clause: “who is a doctor” is embedded within “who lives next door”)

Frequently Asked Questions (FAQ)

Conclusion

Mastering relative clauses is essential for effective communication in English. By understanding the different types of relative clauses, choosing the correct pronouns and adverbs, and following the punctuation rules, you can add depth and precision to your writing and speaking.

Practice the exercises provided in this guide and continue to explore advanced topics to further enhance your skills. With consistent effort, you’ll become proficient in using relative clauses and elevate your English language abilities.