cost
cost - cost
ring
rang - rung
cut
cut - cut
swim
swam - swum
drink
drank - drunk
set
set - set
bend
bent - bent
build
built - built
sink
sank - sunk
blow
blew - blown
eat
ate - eaten
sing
sang - sung
go
went - gone
put
put - put
grow
grew - grown
break
broke - broken
know
knew - known