部分规则动词变成过去式和过去分词时，后面直接加ed .
动词过去式变化规则:
一般在动词末尾加-ed,如:
pull-pulled, cook-cooked
结尾是e加d,如:
taste-tasted
末尾只有一个元音字母和一个辅音字母的重读闭音节, 应双写末尾的辅音字母, 再加-ed, 如:stop-stopped
以"辅音字母+y"结尾的,变y为i, 再加-ed,如:study-studied
不规则动词过去式: am,is-was get-got run-ran draw-drew swim-swam are-were go-went sing-sang drink-drank sit-sat do-did come-came put-put fly-flew see-saw have-had make-made ride-rode say-said eat-ate read-read speak-spoke give-gave take-took write-wrote sweep-swept
过去时态(过去时，现在完成时，过去完成时)
如walk-walked.
i walk home every day.
我走路回家。
i normally take bus home, but yesterday i walked home.
我一般是坐公车回家。可是昨天我走路回家。
i have walked for 3 hours and i am tired.
我已经走了3个小时，很累。
被动式.如:arrest-arrested
i arrested him.
我逮捕了他
He was arrested by me.
他被我逮捕了。
过去分词。也有被动的意思。如:
I saw him arrested by the police.
我看到他被警察逮捕了。