Do you kone the boy waving his hand towards us?为什么用 waving

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Do you kone the boy waving his hand towards us?
为什么用 waving

现在分词
boy和wave之间是主动结构,所以用waving现在分词=who is waving

相当于do you know the boy who is waving his hand towards us
waving做伴随状语

你认识那个正在朝我们招手的男孩么?
因为这里wave his hands是BOY的定语,所以不能直接用wave,而这句话的意思表示的是正在招手,所以得用waving

正确的解析!
因为前面用know,所以后加ing,
就像hear 后面都会加ing