cost, cost, cost
put, put, put
shut, shut, shut
eat,ate, eaten
fall, fell, fallen
see, saw, seen
drive, drove, driven
win, won, won
sell, sold, sold
tell, told, told
meet, met, met
find, found, found
buy, bought, bought
catch, caught, caught
teach, taught, taught
think, thought, thought
drink, drank, drunk
swim, swam, swum
ring, rang, rung
grow, grew, grown
know, knew, known
blow, blew, blown
throw, threw, thrown
(fly), flew, flown