Look at these examples to see how defining relative clauses are used.
Are you the one who sent me the email?
The phone which has the most features is also the most expensive.
This is the video that I wanted to show you.
The person they spoke to was really helpful.
Try this exercise to test your grammar.
Read the explanation to learn more.
Grammar explanation
Relative clauses give us information about the person or thing mentioned.
Defining relative clauses give us essential information – information that tells us who or what we are talking about.
The woman who lives next door works in a bank.
These are the flights that have been cancelled.
We usually use a relative pronoun or adverb to start a defining relative clause: who, which, that, when, where or whose.
who/that
We can use who or that to talk about people. that is more common and a bit more informal.
She's the woman who cuts my hair.
He's the man that I met at the conference.
which/that
We can use which or that to talk about things. that is more common and a bit more informal.
There was a one-year guarantee which came with the TV.
The laptop that I bought last week has started making a strange noise!
Other pronouns
when can refer to a time.
Summer is the season when I'm happiest.
where can refer to a place.
That's the stadium where Real Madrid play.
whose refers to the person that something belongs to.
He's a musician whose albums have sold millions.
Omitting the relative pronoun
Sometimes we can leave out the relative pronoun. For example, we can usually leave out who, which or that if it is followed by a subject.
The assistant [that] we met was really kind.
(we = subject, can omit that)
We can't usually leave it out if it is followed by a verb.
The assistant that helped us was really kind.
(helped = verb, can't omit that)
Do this exercise to test your grammar again.
Hello claudiaxxx
There are different terms out there, but I'd say that it's an object predicative -- it modifies the object 'his uncle'.
All the best
Kirk
The LearnEnglish Team
Hello Tenzin Thinley,
Where and when are not relative pronouns but are actually relative adverbs and they cannot be omitted. You can often use a relative pronoun (that/which) with a preposition, however, and then it may be possible to omit the relative pronoun:
Peter
The LearnEnglish Team
Hello Delrey,
We don't give help with homework or study assignments, I'm afraid. We're happy to give extra explanations of the material on our pages, or help with general questions about the language, but we don't do assignments for our users.
Peter
The LearnEnglish Team
Hello M.bozakil
The verb 'serves' needs a subject, and the subject would be the relative pronoun 'which' or 'that'. 'where' can't be a subject in a relative clause. You could reword the sentence slightly and say 'They ate at a restaurant where they only serve vegan dishes'. In this case, the verb 'serve' has the subject 'they', and 'where' indicates the place.
I hope this helps. If you study relative clauses beginning with 'where' (you can see a few more examples here), I think you'll see that they all have a subject and verb that are other words.
All the best
Kirk
The LearnEnglish Team