写出下列动词过去式keep sleep sweepteach catchbring buy thinksell tellsay paygrow know throw fly

kept slept swept
taught caught
brought bought thought
sold told
said paid
grew knew threw flew

keep -kept
sleep-slept
sweep-swept
teach-taught
catch-caught
bring-brought
buy-bought
think-thought
sell-sold
tell-told
say-said
pay-paid
grow-grew
know -knew
throw-threw
fly -flew