(1/2)感官动词没被动语态,可He was seen(to enter)the building about the time when th
问题描述：
(1/2)感官动词没被动语态,可He was seen(to enter)the building about the time when th
答
see sb do. be seen to do 固定短语。
类似的还有make sb do 和be made to do.
此处成被动式to就不能省
答
如果不是系动词的话有被动形式。
就如同这句。
答
感官动词作系动词用时,没有被动语态：I feel well.
作行为动词用时,有被动语态,你所提到的这个句子中的see就是这种情况.
答
entering