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?

问题描述:

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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