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

1. 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

2.过去式与动词原形一样