Поставие в такую форму, как по образцу.
tall-taller-the tallest
big-
short-
old-
small-
sweet-
hot-
long-
fine-

big-bigger-the biggest
short-shorter-the shortest 
old- oldder-tht olddest
smail- smailler- the smaillest
sweet-sweeter-the sweetest
hot-hotter- the hottest
long- longger-the longgest
fine- finer- the finest
надеюсь помогла )