run的过去式是ran，run的过去分词是原形run，run的现在分词是running。run这个词是动词时，有“跑步，经营”的含义，当其为名词时，其有“跑步，旅程，航程，一段时光，一系列”的含义。

过去时ran例句：

He ran the last block to the White House with two cases of gear.他带着两箱工具跑过最后一个街区到了白宫。

I excused myself and ran back to the telephone.我道了歉，跑回去接电话。

过去分词run 例句：

Have you known someone whose toes or feet have been run over by cars

while crossing the street? 你是否知道有人在过马路时被汽车压过脚趾或脚？

He had run a few dozen marathons before, so he was hardly a beginner.

在此之前，他已经跑过几十次马拉松了，所以他应该不算是初学者。