It's good to see him spending more time with his wife.这句话中为什么spend是ing形式的?我的英语不是很好,还请哪位师傅多多指教啊.十分感谢!

It's good to see him spending more time with his wife.这句话中为什么spend是ing形式的?我的英语不是很好,还请哪位师傅多多指教啊.十分感谢!
It's good to see him spending more time with his wife.这句话中为什么spend是ing形式的?
我的英语不是很好,还请哪位师傅多多指教啊.十分感谢!

It's good to see him spending more time with his wife.这句话中为什么spend是ing形式的?我的英语不是很好,还请哪位师傅多多指教啊.十分感谢!
see sb doing sth 固定用法：看见某人正在做某事
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spending ,是现在分词，做宾语补足语，修饰 him
看到他与他的妻子一起度过更多的时间，真是太好了。

see sb doing sth意思是看见某人正在做某事，在这个句子中，它是强调这一刻我所看见的