Adjective Clause

who --> person
which --> non-person
that --> person/non-person

whom --> person

which --> non-person

that --> person/non-person

I saw the man. The man told me to come back later.

The man whom I saw told me to come back later.

I hired the car. The car broke down.

The car which I hired broke down.

whose --> person/non-person

The film is about a spy. His wife betrays him.

The film is about a spy whose wife betrays him.

The house is awesome. Its walls were made of glass.

the house whose walls were made of glass is awesome.

--> where, that, in which, on which, at which

The garden is beautiful. I met my old friend there.

The garden where I met my old friend is beautiful.

The hotel is old and antique. They are staying at the hotel.

The hotel in/at which they are staying is old and antique.

--> when, that, in which, on which, at which

Did you remember the time? We went to Ani's party at 3 p.m.

Did you remember the time when we went to Ani's party?

The year in which he was born.

The day on which we arrived.

--> why

You should give me a reason why you didn't come to my house.

The reason why he refused is ....