我在书上看到eating habit这一短语,为什么要用eating?是否有doing habit?

His eating habit isn't good.这一句中为什么要用eating而不能用eats Eating habits?还是 eating habit my eating habit My eating habit ()()()his my eating habit? my habit,eating habits health and eating habit 为什么饮食习惯的英文是eating habit而不是eat habit my eating habit 作文 马上就要要 my eating habit英语作文 A Healthy Eating Habit 作文 Good eating habit 英语作文