Easy
do
did
buy
bought
speak-
sing-
spoke
sang
get
got
hold
held
dive-
stand-
dive-dove
stand-stood
know
knew
forget
forgot
understand
feel
understand-understood
feel-felt
make
mean
sleep
slept
meet
tell
meet-met
tell-told
read
read
wear
wore
think
mean
think-thought
mean-meant