Add -s or -es
bag
bags
run
running
wave + ed
waved
fry + ed
fried
fish
fish
wish
wishes
land
landing
skate + er
skater
try + ing
trying
child
children
baby
babies
skip
skipping
sore + ly
sorely
carry + ed
carried
die
dice
potato
potatoes
gallop
galloping
smile + ing
smiling
funny + er
funnier
elf
elves
echo
echoes
sprint
sprinting
care + ful
careful
fortify + ing
fortifying
cactus
cacti