规则动词的过去式词尾变化有几种:1.一般情况下加ed,如watched, planted, watered, pulled, climbed, picked。
2.以不发音字母e结尾的加d,如liked, moved, tasted。
3.以辅音字母加y结尾的变y为i再加ed,如study——studied。
4.以1个元音字母加1个辅音字母结尾的重读闭音节,双写最后一个辅音字母再加ed,如stop——stopped。不规则动词变化如下:do--didrun--ranhave--had drink--drank eat--ate fly--flew swim--swam become--becameride--rode drive--drove stand--stood come--came see--sawgo--went buy--bought take--took write--wrote