我们说主动语态省to,被动语态加to,但是维什莫会出现如下的两个例子?People can be seen running everywhere.We have never seen him look so well.

主动语态省略to是指这样的结构：
We have never seen him look so well.
它的被动语态则是：
He has never been seen to look so well.
更多例子：
He has never been seen to complain or be lazy。
he has never been made. to face it before 。
但是这类感官动词还可以跟另一种宾补：-ing形式,表示看见某人正在做某事
比如说：We can see people running everywher.
被动语态当然就应该是：
People can be seen running everywhere.

see 是感官动词 当其后面的动词表示某一时刻的具体动作时+ing,表示状态时用动词原形