sit and sat, eat and ate, go and went, do and did, have and had, make and made, read and read, stand and stood, come and came, give and gave, leave and left, meet and met, buy and...

动词过去式不规则变形：do-did, is-was, am-was, are-were, have-had, go-went, want-wanted, eat-ate, drink-drank, see-saw, take-took, give-gave, come-came, become-became, lose-lost, ru...