.1. 一般情况与过去式一样,直接加ed或d (以y结尾把y改为I,再加ed)2. AAA型(动词原形,过去式,过去分词同形) cost-cost-cost cut-cut-cut hit-hit-hit hurt-hurt-hurt let-let-let put-put-put read-read-read AAB型(动词原形与过去式同形) beat-beat-beatenABA型(动词原形与过去分词同形) become-became-become come-came-come run-ran-runABB型(过去式与过去分词同形) dig-dug-dug get-got-got sit-sat-sat win-won-won meet-met-met keep-kept-kept sleep-slept-slept sweep-swept-swept feel-felt-felt smell-smelt-smelt leave-left-left build-built-built lend-lent-
