Doing morning exercises is good for you .句首为什么用doing?谢谢

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Doing morning exercises is good for you .句首为什么用doing?谢谢
Doing morning exercises is good for you .句首为什么用doing?谢谢

Doing morning exercises is good for you .句首为什么用doing?谢谢
动词原形不能当主语,所以用它的-ing形式作主语.或者用动词 不定式作主语.

动词不可做主语,所以用动名词形式