Spanish Grammar/Demonstrative Pronouns
When the noun is understood in the context, it can be omitted – but adjectives can't stand alone. In these cases, demonstrative pronouns are used. As shown below, demonstrative pronouns are almost exactly the same as demonstrative adjectives – but there's an accent on the stressed syllable. These accents are actually optional.
|that (over there)||aquél||aquélla||those (over there)||aquéllos||aquéllas||that (over there)||aquello|
Sometimes a demonstrative pronoun refers to something abstract, not referring to any specific noun. Thus it doesn't have a gender, so neither can the demonstrative pronoun: the neuter form is used. Notice that the neuter form does not have accent marks.