Superiority comparison  

One -syllable adjectives and adverbs
small
smaller than
the smallest of, in
large
larger than
the largest of, in
nice
nicer than
the nicest of, in

Adjectives of two or more syllables
intelligent
more intelligent than
the most intelligent of, in
boring
more boring than
the most boring of, in

Two-syllable adjectives ending in y and er
friendly friendlier than the friendliest of, in
clever cleverer than cleverest of, in

Irregular adjectives and adverbs
good better than the best of, in
bad worse than the worst of, in

 

  Inferiority comparison  

Chester is less large than London
They are less intelligent than us
Studying is less bad than doing the housework
English is the least difficult subject of this course

 

  Identity comparison  

Her jumper is as expensive as his shirt
My brother isn't as slim as yours
Your parents are not so young as mine