英语单词see后除了跟动名词形式外,还可以跟动词原形还是动词不定式

1.see sb doing 看到某人正在做某事
I saw him playing basket on the playground.
2.see sb do 强调动作的全过程(要注意这里的do 是省略to的不定式)
I saw him go into that room
如果变为被动to不省略
He was seen to go into that room
3.see sb done 表宾语和动词之间是被动的关系.
I saw him tied to a tree yesterday.
我昨天看见他被绑在一棵树上了.
此类词还有:
see,watch,look at,observe
hear,listen to.
feel