e,am ,is -was are-were begin-began break-kroke bring-brought build-built buy-bought can-could catch-caught come-came do-did draw-drew drink-drank drive-drove eat-ate fall-fell feed-fed feel-felt find-found fly-flew forght-forgot get-got go-went have,has-had hear-heard hold-held keep-kept knoe-knew learn-learnt,learned leave-left let-let make-made may-might mean-meant meet-met must-must put-put read-read ride-rode ring-rang run-ran say-said see-saw sell-sold shall-should shoe-shoeed sing-sang sit- sat sleep-slept speak-spoke stand-stood swim-swam take-took teach-taught tell-told think-thought throw-threw understand-understood will-would write-wrote
动词的过去式一般情况下都是在单词后面直接加ed ,而那些特殊情况的词需要你平时积累,毕竟特殊的占很小的一部分,很容易记的.