Comparatives and superlatives are used to compare two or more objects. There are four main rules for forming comparatives and superlatives from adjectives:
1. One syllable adjectives add -er for comparatives and -est for superlatives.
2. Adjectives ending in y change to -ier and -iest.
3. Adjectives with two or more syllables use 'more' or 'most' before the base adjective.
4. A few adjectives are irregular, including good, bad, and far, which have the forms better, worse, and furthest for comparatives and superlatives.