①一般情况下,在动词原形后直接加ed.

　　如：wanted,played.

　　②以不发音的字母e结尾的动词,直接加d.

　　如：hoped,lived.

　　③重读闭音节单词需双写最后一个辅音字母,再加ed.如：stopped,shipped.

　　④以辅音字母+y结尾的动词变y为i,再加ed.

　　如：studied,worried.

　　⑤有些动词不符合上面的规则,需要特殊记忆.

　　如：am(is)-was,are-were,go-went,eat-ate,

　　swim-swam,buy-bought,see-saw,

　　teach-taught,bring-brought,think-thought,

　　fall-fell,hurt-hurt,break-broke,win-won,

　　lose-lost