Superlative Adjectives

A superlative adjective expresses the extreme or highest degree of a quality. We use a superlative adjective to describe the extreme quality of one thing in a group of things.

In the example below, "biggest" is the superlative form of the adjective "big":

A B C

A is the biggest.

Formation of Superlative Adjectives

http://www.englishclub.com/grammar/adjectives-superlative_2.htm

Use of Superlative Adjectives

http://www.englishclub.com/grammar/adjectives-superlative_3.htm