do exercise 加s么?
问题描述：
do exercise 加s么?
答
可加可不加；
跟据情况。
答
可以加也可以不加
答
exercise作练习讲时是可数名词,作锻炼讲时是不可数.
We have many exercises to do every day.可数
We do morning exercise every morning.不可数