As adjectives they modify/describe a noun that follows. As pronouns, they identify or point to a noun.
In the following examples pronouns that function as adjectives and nouns that follow them are [marked with brackets].
this, that, these, those, such
As Demonstrative Pronouns: I studied that. This is a pronoun.
As Demonstrative Adjectives: I like [these questions]. [That word] is an adjective.
whose, which, what
As Interrogative Pronouns: Which did you prefer? Whose is it?
As Interrogative Adjectives: [Which quiz] did you take? [Whose car] did you see?
another, any, both, each, either, few, many, neither, one, some, etc.
As Indefinite Pronouns: Several are good at it. I have a few. Both will be selected.
As Indefinite Adjectives: [Several players] are good at it. I have a [few books]. [Both students] will be selected.
For additional examples please refer to Pronouns page.