一般过去式的动词不规则变化有哪些单词

1、中间去e末尾加t,如：keep→kept,feel→felt,sleep→slept,sweep→swept2、结尾d变t,如：build→built,lend→lent,send→sent,spend→spent3、遇见i改为a,如：ring→rang,sit→sat,drink→drank,sing→sang,swim→...