Ответ:

Adjective    Comparative   Superlative

Interesting  more interesting    the most interesting

small               smaller        the smallest

expensive   more expensive    the most expensive  

 thin                 thiner            the thinnest

short               shorter          the shortest

exciting       more exciting   the most exciting      

fat                     fater                 the fatest

fantastic     more fantastic     the most fantastic    

colourful   more colourful     the most  colourful

young       younder          the youngest

new                newer          the newest

delecious     more delecious    the most  delecious

old                  older                the oldest