whose
The Spanish word for 'whose' is 'cuyo'. It can be used in sentences to express possession and is often followed by a noun. Depending on the gender and the number of the noun that follows, 'cuyo' can take the forms 'cuyo', 'cuya', 'cuyos' and 'cuyas'.
I live in the house whose roof is red.
'Cuyo' is used to establish the connection between the red roof and the house.
I'm looking for the boy whose dog won the pet contest.
'Cuyo' is used to show relation or connection between the dog that won the contest and the boy.
You are the woman whose coat is blue.
'Cuyo' is used to describe the woman with a particular attribute - owning a blue coat.
This is the car whose engine is very powerful.
In this sentence, 'cuyo' shows connection between the car and its attribute - having a powerful engine.
I know an artist whose work I admire.
'Cuyo' indicates the relationship between the work that I admire and the artist.
She is the girl whose cat got lost.
'Cuyo' specifies the relationship between the lost cat and the girl.
That is the bird whose song we hear every morning.
'Cuyo' specifies the bird we are referring to, and we identified it by the song it sings every morning.
This is the book whose author won the Nobel Prize in Literature.
'Cuyo' connects the winning author with his/her book.
We are looking for the man whose car was stolen.
'Cuyo' defines the relationship between the stolen car and the man it belongs to.
I want to thank the person whose money financed this library.
In this example, 'cuyo' is used to indicate possession. The ownership of the money, which financed the library, belongs to a person.