过去式过去分词 arrived arrivedsent sentmade madeheard heardgot gottenwas/were beenwent gonedid donereached reachedfound foundstarted startedtook takendiscovred discoveredworked workedborrowed borrowedseen seen
speed的过去试和过去分词. sped or speeded，sped or speeded2种用法都可以 英美习惯而已
过去分词beat beaten区别 没有区别.beat作为过去分词时，一般是美式英语用法，当然beat也可以是beat的过去式；而beaten只是beat的过去分词，一般是英式英语用法.
