一、规则变化

　　1、 一般情况下，动词词尾加-ed, 如：work—worked play—played want—wanted ask—asked

　　2、 以不发音的-e结尾动词，动词词尾加-d, 如：live—lived move—moved taste—tasted

　　3、 以“辅音字母+y”结尾的动词，把y改成i, 加—ed, 如：study—studies try—tried copy—copied carry—carried

　　4、 重读闭音节动词，双写词尾辅音字母，再加—ed, 如：stop—stopped

　　二、不规则变化

　　is am—was are—were do—did have has—had go—went meet—met come—came take—took steal—stole eat—ate fly—fliew run—ran see—saw say—said make—made find—found stand—stood

　　sit—sat sing—sang drink—drank give—gave ring—rang swim—swam

　　write—wrote ride—rode drive—drove

　　draw—drew grow—grew know—knew

　　get—got forget—forgot

　　sweep—swept keep—kept sleep—slept

　　speak—spoke break—broke

　　tell—told sell—sold

　　buy—bought think—thought catch—caught teach—taught build—built

　　can—could shall—should will—would

　　过去式与动词原形一样：let—let must—must put—put read—read