expensive → more expensive → the most expensive 

thick → thicker → the thickest

friendly → more friendly → the most friendly

fine → finer → the finest

thin → thinner → the thinnest

difficult → more difficult → the most difficult

warm → warmer → the warmest

wise → wiser → the wisest

easy → easier → easiest

wonderful → more wonderful → the most wonderful

sunny → sunnier → the sunniest

fat → fatter → the fattest

long → longer → the longest

$@Ly$

Adjetive Comparative Superlative
interesting ,           more interesting, the most interesting
expensive ,            more expensive ,the most expensive
thick,        thicker ,the thickest
friendly,        more friendly ,the most friendly
fine ,        finer ,the finest
thin,           thinner ,the thinnest
difficult,          more difficult ,the most difficult
warm,          warmer, the warmest
wise ,      wiser, the wisest
easy,     easier ,the easiest
wonderful,     the more wonderful, the most wonderful
sunny,     sunnier ,the sunniest
fat,     fatter, the fattest
long,     longer, the longest