take----took----taken
see---saw---seen
lend--led---led
leave---left--left
go----went---gone
fiy--flew--fiown
sit--sat--sat
teach--taught--taught
come--came--come
have--had--had
bring--brought--brought
make--made--made
get--got--gotten/got
spend--spent--spent
pay--paid--paid
write--wrote--written
ring--rang--rung
read--read--read
understand--understood--understood
sell--sold--sold