【怎么把单词变为过去式,一般规则有哪些?要说得简单一些，别忘了举例子。（例子举一两个就行）如：1····················································2·····】

　　怎么把单词变为过去式,一般规则有哪些?

　　要说得简单一些，别忘了举例子。（例子举一两个就行）

　　如：

　　1····················································

　　2····················································

　　3····················································

　　4····················································

　　······················································

　　回答好加分哦！