第三人称单数；goesdoesworksleavesplays
,现在分词,going doing working leaving playing
过去式,went did worked left played
过去分词 gone done worked left played那stop sit carry buy spend的呢第三人称单数 stops sits carries buys spends，现在分词stoping siting carrying buying spending过去式stopped sat carried bought spent过去分词 stopped sat carried bought spent