catch、bring、buy、think、begin、drink、ring、sing、swim、sit、lend、build、sell、tell、的过去式

catch--caught
bring--brought
buy--bought
think--thought
begin--began
drink--drank
ring--rang
sing--sang
swim--swam
sit--sat
lend-lent
build--built
sell--sold
tell--told
pay--paid
meet--met
feed--fed
grow--grew
know--knew
throw--threw