She saw them come into the room.变被动语态

问题描述:

She saw them come into the room.变被动语态

They were seen to come into the room.

they were seen into the room by her

They were seen to come into the room by her.
see sb do sth 改成被动为 sb be seen to do sth
即主动不加to,改成被动必加to.