go + v-ing 表示去做某事，游泳是swim 所以， 去游泳就应该是go swimming. 因为swim是一个以一个辅音字母为结尾的动词，其动名词形式就是双写m+ing。
I went round to Jonathan's to see if he wanted to go swimming
我去乔纳森那里看看他是否想去游泳。
At breakfast next morning my two grandsons were clamouring to go swimming.
第二天早饭时，我那两个孙子嚷嚷着要去游泳。
We really shouldn't have let him go swimming by himself.
千不该万不该，不该让他独自一人去游泳。
Playing cards is no fun; let's go swimming.
打扑克没劲，咱们去游泳吧。
I often go swimming in summer.
夏天我经常去游泳。
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