see sb. doing的被动是变成sb. be seen to doing吗?还是sb.be seen doing

see sb. doing的被动是变成sb. be seen to doing吗?还是sb.be seen doing 还是其他的形式
急啊~希望给个权威点的答案。谢谢!

第1个回答  2009-10-16
sb. be seen to doing