常见的不规则动词的过去式：1. 不变： cost-cost hurt-hurt put-put let-let read-read2. 只变一个元音字母： o-a come-came become-became i-a begin-began drink-drank give-gave ring-rang sing-sang swim-swam i-o win-won drive-drove ride-rode o-e throw-threw know-knew a-e draw-drew fall-fell e-o get-got forget-forgot3只变一个辅音字母：build-built has / have-hadlend-lent lose-lostmake-made send-sent spend-spent增加一个辅音字母:hear-heard burn-burnt learn-learnt mean-meant4. 改变两个元音字母：break-broke speak-spoke choose-chose feed-fed meet-met feel-felt sweep-swept wear-worelie-lay say-said see-saw5过去式含有ought / aught：buy-bought bring-broughtfight-fought think-thoughtcatch-caught teach-taught 6情态动词：can-could shall-should will-would may-might 7.原形中有-ell: sell-sold tell-told smell-smelt8其他:be-was/were do-did find-foundfly-flew go-went leave-leftstand-stood understand-understood 下面是一些常见的不规则动词的过去式。be was/were leave left buy bought meet metcome came read readdo did see saw get got spend spent have had swim swamwrite wrote take took