TO SING
SANG, SUNG
TO SIT
SAT, SAT
TO SPEAK
SPOKE, SPOKEN
TO SPEND
SPENT, SPENT
TO SMELL
SMELT, SMELT
TO SPILL
SPILT, SPILT
TO SLEEP
SLEPT, SLEPT
TO SPOIL
SPOILT, SPOILT
TO SINK
SANK, SUNK
TO SPELL
SPELT, SPELT