sleep	slept, slept
speak	spoke, spoken
spell	spelt, spelt
spend	spent, spent
stand	stood, stood
steal	stole, stolen
swim	swam, swum
swing	swung, swung
take	took, taken
teach	taught, taught
tell	told, told
think	thought, thought
throw	threw, thrown
understand	understood, understood
wake	woke, woken
wear	wore, worn
win	won, won
write	wrote. written