This document discusses comparative adjectives used to compare two things. It provides examples of using "-er" and "than" to compare cities and temperatures, such as "Andalusia is bigger than Madrid" and "Seville is hotter than A Coruña." It also discusses using "more" and "than" with adjectives that have two or more syllables, like "Granada is more beautiful than Valladolid." Exceptions to the rules are provided.