run
ran-run
take
took-taken
drink
drank-drunk
buy
bought-bought
bring
brought-brought
see
saw-seen
think
thought-thought
forget
forgot-forgot (forgotten)
teach
taught-taught
eat
ate-eaten
fly
flew-flown
fight
fought-fought
cost
cost-cost
begin
began-begun
swim
swam-swum
catch
caught-caught
become
became-become