题目内容：

He is too young to be sent to school?
The box is too heavy to carry/be carried.
为何第一个句子必须用被动,第二个主被动都可以呢?

优质解答

这个问题问的很好!可以逐句分析：He is too young to be sent to school?他太年幼了,还不能【被送到】学校去.主语he和send只能是被动关系,即【他被送去】.The box is too heavy to carry/be carried.这个盒子太重了,...