Just Add -ed
walk
walked
sing
sang
go
went
rick
ricked
jump
jumped
drink
drank
be
was
zib
zibbed
play
played
ride
rode
do
did
spow
spowed
try
tried
blow
blew
eat
ate
plund
plunded
manage
managed
feel
felt
buy
bought
spling
splung? splinged?