We use defining relative clauses to give information about the person or thing that we are talking about, it allows us to identify them.

To form a defining relative clause, we use a relative pronoun and a verb.

Relative pronouns :

Examples :
– The doctor who works at the hospital. (we are talking about one doctor in particular).
– She’s the girl whose house is very old. (we are adding detail to talk about the girl)
– The guitar that broke yesterday.
– It’s the reason why I’m coming.
– The park where I lost my dog.
– Do you remember that day when I found a wallet ?