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?

分类: 作业答案 • 2021-12-20 03:41:53

问题描述：

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?

答

这里的动词+ing 成为动名词，在语法中作名词用。

答

因为是动词做主语放在句首所以要用动名词的形式