1、以不发音的字母e结尾的动词,直接加-d,如:lived,achieved
2、在动词原形后直接加ed,如:wanted,played.
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。
以上仅供参考,希望对你有所帮助!