To make the comparative form of adjectives (like 'bigger' or 'more expensive') and the superlative form (like 'biggest' or 'most expensive'), first we need to know how many syllables are in the adjective. Adjectives with one syllable Usually if an adjective has only one syllable, we add 'er' to make the comparative form. We add 'est' to make the superlative form. clean → cleaner / cleanest cold → colder / coldest small → smaller / smallest young → younger / youngest tall → taller / tallest There are some spelling changes. If there is one vowel followed by one consonant at the end of the adjective, we often double the consonant. wet → wetter / wettest big → bigger / biggest hot → hotter / hottest thin → thinner / thinnest If the adjective ends in 'y', this often changes to 'i'. dry → drier / driest If the adjective ends in 'e', we don't add another 'e', just 'r'. nice → nicer / nicest...