初中英语句子the box is too heavy for the child to carry,句末为什么不加it

题目

初中英语句子the box is too heavy for the child to carry,句末为什么不加it
类似的题目如何判断，比如please bring him a chair to sit on

答案

too……to是短句,所以不要加the box is so heavy that the child cant carry it 这是一句复合句,所以要加it please bring him a chair to sit on解释为请给他一把椅子坐too……to解释为太……以至于不能……所以这两...