This document provides examples of comparative adjectives used to compare two things and lists rules for forming comparative adjectives in English. It gives sentences comparing the height of celebrities, temperatures of countries, sizes of places, hardness of materials, ages of musicians, and more. The key things to remember are that comparative adjectives are used to compare two items, "er" is usually added to adjectives, "r" is added if the adjective ends in "e", and some adjectives double the last consonant before adding "er".