Sleep
slept - slept
Cost
cost - cost
Come
came - come
Say
said - said
Let
let - let
Freeze
froze - frozen
Fight
fought - fought
Catch
caught - caught
Know
knew - known
Learn
learnt - learnt
Fall
fell - fallen
Fly
flew - flown
Lie
lay - lain
Bet
bet - bet
Lose
lost - lost
Eat
ate - eaten
Hurt
hurt - hurt
buy
bought - bought
Burn
burnt - burnt
Go
went - gone
Can
could
Hear
heard - heard