When an adjective ends on een
e , then you only need to add -
r of
-st erachter: Example: close - close
r - close
stWhen it ends on a,e,i,o,u + 1 consonant, you then double the consonant. Examples: big - bigger - biggest/fat-fatter-fattest
When it ends on -y , you add -ier of -iest achter:
Examples: dry - drier - driest / happy-happier-happiest