请问swim和swimming的区别，谢谢。

swim是动词原形，而swimming是动词swim的—ing形式。我们知道，动词原形在句子中可以用作谓语；而动词的-ing形式在句子中不可以作谓语，动词的这种形式称为动词的非谓语形式。在句子中可以做主语，宾语，表语或状语等。
如：I often swim in the river.
Swimming is very interesting.
She likes swimming very much.
His hobby is swimming.

swim名词 swimming动名词 作名词用 也可用在现在进行或过去进行时中

swim 游泳 swimming 表示正在进行游泳这项运动

swim是单独动词，
加上ing表示正在执行中。

swim是动词原形，而swimming是它的现在进行时，即现在分词