Demonstrative adjectives (this, that)

masc. sing.

fem. sing.

masc. plural

fem. plural

este

(this)

esta

estos

estas

ese

(that, nearby)

esa

esos

esas

aquel

(that, far)

aquella

aquellos

aquellas

If you find these demonstratives bearing accent marks (éste, ése, aquél, etc.), they are demonstrative pronouns. Éste es mío = "This (masculine thing) is mine."

Esto, eso, and aquello are neuters, and they are demonstrative pronouns, not adjectives. (Spanish has no neuter adjectives, since it has no neuter nouns for them to modify.). They are used to refer to concepts, ideas, or topics: Esto es bueno = "This (idea, suggestion, situation) is good."