sing
sung
give
given
enjoy
enjoyed
put
put
begin
begun
hit
hit
read
read
spend
spent
pay
paid
teach
taught
drink
drunk
solve
solved
grade
graded
deliver
delivered
hide
hidden
buy
bought
sell
sold
break
broken
go
gone
find
found
offer
offered
invent
invented
send
sent
design
designed
improve
improved