Relative Clauses in English: A Complete Guide

A relative clause is a part of a sentence that gives more information about a noun. It works like an adjective: it describes or identifies someone or something. Relative clauses are very common in English, and learning to use them well will make your writing and speaking much more natural.

For example, instead of saying two short sentences, you can combine them into one using a relative clause. This makes your English flow better and sound more fluent.

Simple Examples to Get Started

The man who lives next door is a doctor.
The book that I borrowed was very interesting.
The city where I was born is quite small.
She is the person whose bag was stolen.

In each sentence, the underlined part is the relative clause. It tells us more about the noun before it (the man, the book, the city, the person).

The Key Elements of Relative Clauses in English

To understand relative clauses, you need to know three main things: the relative pronouns, the antecedent, and the type of clause (defining or non-defining). Let us look at each one.

Relative Pronouns

A relative pronoun connects the relative clause to the noun it describes. Here are the most common ones:

Relative Pronoun	Used for	Example
who	people	The girl who called is my sister.
which	things or animals	The car which broke down was new.
that	people or things (informal)	The film that we watched was great.
whose	possession (people or things)	The man whose dog barked apologised.
where	places	The town where she grew up is lovely.
when	time	The day when we met was special.

The Antecedent

The antecedent is the noun that the relative clause refers to. It always comes just before the relative clause. It is important to place the clause as close as possible to the antecedent to avoid confusion.

I spoke to the woman who manages the project. → ‘the woman’ is the antecedent.
We visited a museum that was built in 1850. → ‘a museum’ is the antecedent.

Defining vs Non-Defining Relative Clauses

This is one of the most important distinctions in English grammar. A defining relative clause gives essential information. Without it, the sentence loses its meaning. It does not use commas.

The student who passed the exam will get a certificate. (We need to know which student.)

A non-defining relative clause adds extra information that is not essential. It is separated by commas, and you cannot use ‘that’ in this type.

My brother, who lives in London, is a chef. (We already know which brother.)
Paris, which is the capital of France, attracts millions of tourists.

Why Relative Clauses Matter in English

Using relative clauses makes your English richer and more precise. Instead of repeating nouns or writing very short sentences, you can express complex ideas clearly and efficiently. They are essential in both written and spoken English.

Compare these two versions:

Without relative clause: I met a man. The man is a famous writer.
With relative clause: I met a man who is a famous writer.

The second version is more natural and fluent. Native speakers use relative clauses constantly, so understanding them helps you both understand and produce real English.

Comparison with Other Languages

If you speak French or Spanish, you already use relative clauses in your language. Here is how they compare:

Language	Relative Pronoun	Example
English	who / which / that	The man who called is my boss.
French	qui / que / dont / où	L’homme qui a appelé est mon patron.
Spanish	que / quien / donde / cuyo	El hombre que llamó es mi jefe.

The structure is similar across these three languages, which is good news! However, English does not change the pronoun based on gender (no masculine or feminine forms). Also, English sometimes allows you to omit the relative pronoun altogether in defining clauses:

The book that I read was amazing. → The book I read was amazing. (Both are correct!)

This is not possible in French or Spanish, where the relative pronoun is always required.

A Complete Example

Let us look at a short paragraph that uses different types of relative clauses:

My colleague Anna, who has worked here for ten years, recently moved to a new office. The office, which is on the third floor, has a wonderful view. It is the kind of place where you feel motivated to work. Anna is the person whose ideas always inspire the whole team.

who has worked here for ten years → non-defining clause about Anna
which is on the third floor → non-defining clause about the office
where you feel motivated to work → defining clause about the place
whose ideas always inspire the whole team → defining clause showing possession

Key Points to Remember

Relative clauses give more information about a noun.
Use who for people, which for things, and that for both (in defining clauses).
Use whose for possession, where for places, and when for time.
Defining clauses are essential to the meaning → no commas.
Non-defining clauses add extra information → use commas, no ‘that’.
In English, you can sometimes drop the relative pronoun in defining clauses.
Keep the relative clause close to the noun it describes.

Sources

Swan, M. (2005). Practical English Usage. Oxford University Press.
Murphy, R. (2019). English Grammar in Use (5th edition). Cambridge University Press.
Biber, D., Johansson, S., Leech, G., Conrad, S., and Finegan, E. (1999). Longman Grammar of Spoken and Written English. Pearson Education.