Doing exercise is good for your health .和 Swimming is good exerci_英语解答

Doing exercise is good for your health .和 Swimming is good exercise.
这两句话为什么要在动词加ing?

人气：317 ℃　时间：2019-09-18 05:29:48

解答

因为是动词做主语放在句首所以要用动名词的形式