Pronouns - Demonstrative Pronouns

A demonstrative pronoun points to some noun going after it.

That is a banana. (‘That’ points to the object ‘a banana’.) These are good apples. (‘These’ points to the object ‘apples’.)

When ‘this’, ‘that’, ‘these’ and ‘those’ are used with some noun, they are referred to as demonstrative adjectives.

That house is mine (Ask the question ‘which house?’ and you get the answer ‘that’.) Keerti gave me this pen. (Ask the question ‘which pen?’ and you get the answer ‘this’.) I can solve these puzzles. (Ask the question ‘which puzzles?’ and you get the answer ‘these’.) Those boys were playing in the park. (Ask the question ‘which boys?’ and you get the answer ‘those’.)

[Remember: A noun does not immediately follow a demonstrative pronoun, while a demonstrative adjective always comes before a noun.]