1.一般直接加ed.如work--worked,clean--cleaned 2.以e结尾的后面只加d.如agree--agreed,hope--hoped 3.以辅音字母加y结尾的改y为i再加ed.如study--studied,carry--carried 4.以元音字母加y结尾的后加ed.如play--play 5.以重读闭音节加辅音字母结尾的,先双写该辅音字母再加ed.如stop--stopped,fit--fitted (如果回答得不好请多多包涵)