The document provides instruction on how to form comparative adjectives and compares things using comparative adjectives. It explains that to form a comparative adjective, "er" is added to adjectives with one syllable and the spelling is adjusted for adjectives ending in "y" or a consonant+vowel+consonant. For adjectives with more than one syllable, "more" is used in front of the adjective. Examples are given comparing Iceland to Mexico and cities using comparative adjectives like "colder", "bigger", and "more expensive". Students are assigned an exercise comparing themselves or other things using comparative adjectives.