由“动词原形+-ed”构成,具体变化有：

1.直接在词尾加-ed.如:want—wanted,work—worked,need—needed,clean—cleaned

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