This, That, Those & These – Demontratives
Demonstratives are used to point out objects and persons while considering their distance from the speaker. Demonstratives may fall under Adjectives as well as Pronouns.
NOTE: ESTO, ESO and AQUELLO are neutral terms and are used to refer to statements, abstract ideas or something that has not yet been identified. Therefore, ESTO, ESO and AQUELLO have neither plural nor singular, feminine nor masculine forms.