Adjective Phrases

An adjective phrase is a phrase with an adjective as its head. An adjective can be intensified by an adverb (as in very good, extremely popular, more difficult), and   complemented in various ways.  An adjective phrase can also have an adverb as a postmodifier, as in big enough. Adjective phrases function as modifiers of nouns or as predicatives.

An adjective phrase modifies a noun or pronoun. It always comes immediately after the noun or pronoun it modifies.

Example:

Joe is the student with the highest grade.
("with the highest grade" modifies student.)