This pronoun is used to refer to people
Who
A chef is a person _________ cooks delicious food.
Who
I am going to go to USA. My aunt lives in USA.
I am going to go to USA where my aunt lives.
This pronoun is used to refer to animals or things
Which / that
We have to go to the place _________ your uncle works.
Where
My grandma has a beautiful cat. Cat is my favorite animal.
My grandma has a beautiful cat which is my favorite animal.
This pronoun is used to refer to places
Where
Africa is a place _________ many animals live. For example, lions ________ are the wildest animals there.
Where / which
Sam is a journalist. A journalist writes news to inform people.
Sam is a journalist who writes news to inform people.
This pronouns is used to refer to time
When
It was 7:30 pm _________ I got to the restaurant _________ my dad works as a chef
When / where
During the spring there are beautiful flowers. In March the spring starts.
In March, when the spring starts, there are beautiful flowers.
Say the relative pronouns
Who, which or that, where and when
My favorite animal is the whale ________ is the biggest mammal in the world. You can go to Australia ________ you can see some whales in the ocean. My uncle is a marine biologist _________ studies animals form the ocean.
Which / where / who
Amy works in a library. In a library you can find a lot of interesting books.
A my works in a library where you can find a lot of interesting books.