规则动词的过去式和过去分词是在动词后面加-ed,如果动词原形本身是以清辅音结尾,则-ed读 t,如work - worked,如果动词原形本身以浊辅音或元音结尾,则-ed读 d,如study - studied,climb - climbed,如果动词原形本身以t或d结尾,则-ed读 id,如mend - mended,shout - shouted