Adjective Clauses — Interactive Lesson

What Is an Adjective Clause?

A simple idea — it's just a description that uses a whole mini-sentence.

A group of words that describes a noun (a person, place, or thing). It works like a built-in description, and it always starts with a connector word like who, which, that, whose, where, or when.

💡 Think of it as a sticky label attached to a noun — it tells you which one or what kind.

Without the clause

"The man is my uncle."

Which man? We don't know.

With the clause

"The man who is wearing a red hat is my uncle."

✓ Now we know exactly which man!

The Connector Words

The word you choose tells your reader what kind of noun is being described.

who

For people

"The student who sits next to me is from Japan."

which

For things & animals

"The book which I borrowed is overdue."

that

For people or things (informal)

"The film that we watched was amazing."

whose

Shows belonging

"The girl whose bag was stolen called the police."

where

For places

"The café where we met has closed down."

when

For times

"I remember the day when we first met."

Where Does It Go — and the Comma Rule

The clause always sits right after the noun it describes. But commas depend on whether the information is essential.

No commas — defining

Defining clause

The information is essential — without it, we don't know which person/thing is meant.

The woman who called you left a message. (which woman? the one who called)

Commas — non-defining

Non-defining clause

The information is extra detail — we already know which one. Remove it and the sentence still makes sense.

My sister, who lives in London, is visiting next week. (I only have one sister — the clause is bonus info)

🔑 Quick test: Remove the clause. If the sentence loses its meaning, no commas. If it still makes sense, add commas.

Is the Connector the Doer or the Receiver?

The connector word can play two different roles inside its own clause — and this decides whether you can leave it out.

Sometimes the connector word is doing the action — it sits right before the verb. Other times, someone else does the action and the connector is receiving it — a subject slips in between the connector and the verb. When the connector is the receiver, you can often leave it out completely (in defining clauses only).

Connector is the doer

"The man who called you is my brother."

"who" sits right before the verb "called" — must keep it.

Connector is the receiver

"The man (who) I met yesterday is my brother."

✓ "I" comes between "who" and the verb — you can drop "who".

💡 If the connector is glued directly to a verb, it's doing the action and has to stay. If another word (a subject) slips in between the connector and the verb, the connector is only receiving the action — and it's optional.

🔑 Key rule: Connector + subject + verb → the connector can usually be dropped. Connector + verb (nothing in between) → the connector must stay.

Exercise 1

Choose the Right Connector

Word Bank: who · which · that · whose · where · when

Question 1 of 5

The doctor __________ treated me was very kind. (person)

Question 2 of 5

This is the restaurant __________ we had our first date. (place)

Question 3 of 5

The student __________ phone rang during the exam had to leave. (belonging)

Question 4 of 5

The laptop __________ I bought last year has already broken. (thing)

Question 5 of 5

I still remember the summer __________ we travelled across Europe. (time)

Exercise 2

Combine the Sentences

Join each pair into one sentence using the connector shown. Don't forget the comma rule!

Question 1 of 4

"I have a neighbour."+ "She bakes bread every Sunday." → usewho

Question 2 of 4

"We visited a castle."+ "It was built in the 12th century." → usewhich

Question 3 of 4

"I met a man."+ "His daughter is a famous singer." → usewhose

Question 4 of 4

"Bangkok is a city."+ "Street food is amazing there." → usewhere

Exercise 3