One syllable words add er:New becomes newer Two or more syllable words add more first:Intelligent becomes more intelligent Words that end in y become ier: pretty become prettier Words that end in er add er:Clever becomes cleverer Words that end in le add er:Simple becomes simpler Words that end in ow add er:Yellow becomes yellower
example
Adjective Comparative Superlative good better the best irregular Tara is the best athlete in the school.well (healthy)better the best irregular He is still in hospital, but he is better than he was last week.