一般在动词原形末尾加-ed：
play——played clean——cleaned visit——visited
ask——asked watch——watched stay——stayed
cook——cooked help——helped walk——walked
look——looked start——started enjoy——enjoyed
rain——rained
结尾是e的动词加-d：
live——lived hope——hoped use——used
practice——practiced dance——danced
末尾只有一个辅音字母的重读闭音节词,先双写这个辅音字母,再加-ed：
stop——stopped plan——planned
以辅音字母加y结尾的动词,先变“y”为“i”,再加-ed：
study——studied carry——carried worry——worried