Doubling Rule
big + er
bigger
slide + ing
sliding
copy + ing
copying
jump + ing
jumping
cute +er
cuter
hurry + ed

hurried
hop + ed

hopped
smile + ed
smiled
tasty + er
tastier
quit + ing
quitting
slip + ing
slipping
invite + ing
inviting
copy + er
copier
help + ed

helped
begin + ing
beginning
include + ed

included
annoy + ing
annoying