exercise有复数形式吗?I keep healthy by doing some exercises.这句话对吗?
问题描述:
exercise有复数形式吗?
I keep healthy by doing some exercises.这句话对吗?
答
可用作动词和名词
有“练习,习题,训练,锻炼,演习”的意思,在“训练,锻炼”讲时不可数,其它的可数