swim没有被动语态
swim为谓语动词，只能作句子谓语。swimming为非谓语动词，属于非谓语动词中的动名词一种，具有名词的特性，可以作句子主语、宾语，以及定语，还有表语等。
1、swim例句:
He can swim well.他游泳游得很好。
He has swum the English Channel three times.他已三次游过英吉利海峡。
He was hot and tired and his head was swimming.他又热又累，头晕目眩。
He goes for a swim every morning他每天早晨去游泳。
2、swimming例句:
Swimming was one of her greatest satisfactions.游泳是她最大的乐趣之一。
He broke several world swimming records at the 1996 Olympics.他在1996年的奥运会上打破了好几项世界游泳纪录。
The fish dive down to about 1，400 feet and then swim south-west.鱼下潜到大约1，400英尺然后向西南方游去。
He landed two 5 lb chub from the same swim. 他在同一个深潭钓了两条五磅重的圆鳍雅罗鱼。
Fish attempt to swim through the mesh and become entangled.鱼试图游过网眼，结果被网缠住
