Spanish Grammar/Relative pronouns

Relative pronouns are used to join a pronoun to an entire clause.

An example in English:

It was Lucy who sent the letter.

"Who sent the letter" is a relative clause and "who" is a relative pronoun. "Who" refers to the same thing as "it".

Masculine Singular	Feminine Singular	Masculine Plural	Feminine Plural	English
cuyo	cuya	cuyos	cuyas	whose
el cual	la cual	los cuales	las cuales	the one(s) who, the one(s) that
lo que				that which, what, whatever
		los que	las que	those who, those that
que	que	que	que	that, who, which