1、直接在词尾加-ed.如:want—wanted，work—worked，need—needed，clean—cleaned
2、以不发音的e结尾的在词尾加-d.如：like—liked，live—lived，use—used，move—moved
3、以一个元音字母加一个辅音字母结尾的重读闭音节动词，先双写结尾的辅音字母，再加-ed.如：stop—stopped，trip—tripped
4、以辅音字母加y结尾的动词，先把y变成i，再加-ed.如：study—studied，carry—carried，hurry—hurried，marry—married
