In most cases, the comparative and superlative of an adjective is formed by simply adding “er” and “est” to the original adjective. But not so with the adjectives “good” and “bad.” There, entirely different words (better, best, worse, worst) are used for the comparative and superlative forms. Nor is this unique to English. French, German, and Latin, to name but three, do exactly the same thing with their forms of these adjectives. Wonder why these adjectives are so often exceptional in their formations.