Adding -ed
rub
rubbed
trot
trotting
fast
faster
hot
hottest
wet
DOUBLE
wettest
flip
flipped
hop
hopping
big
bigger
thin
thinnest
paint
NAH!
painter
shout
shouted
walk
walking
glad
gladder
cold
coldest
clap
DOUBLE
clapping
regret
regretted
begin
beginning
later
dim
dimmest
look
NAH!
looked
show
showed
hope
hoping
funny
funnier
happy
happiest
open
NAH!
opening