can be doing与can do 区别
问题描述：
can be doing与can do 区别
在ietls 真题6考官范文里第168和172页,有以下2个句子
I would say that change can be stimulating and energising for individuals.
Sitting in front of a screen for too long can be damaging to both the eyes and the physical posture of a young child.
为什么要用can be doing 而不是 can do
答
看表达需要：can be doing表示的是一种动态,而can do 则是静态.这是其中最大的区别.但两种都是正确的用法,用在本文中完全可以.