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?

Doing eye exercise is good for our eyes Doing eye exercise is good for our eyes Doing exercise is good for our h___补单词 Doing morning _____(exercise) is good for our health. What is the purpose of doing physical exercise Doing exercise is good for （stay）healthy Doing exercise is good for (stay) healthyfor后填啥? If you want to be healthy,（）is（）.A.do more exercise；helpingB.do more exercise；helpfulC.doing more exercise；helpfulD.doing more exercise；helping doing morning _____(exercise)is good for you health里exercise怎么变 Go on_____ Exercise 2 after you have finished Exercise 1A by doing B doing C to do D with doing What you need is more_____.You are always doing your______at your desk.A.exercise;exercise B.exercises;exercisesC.exercises;exercise D.exercise;exercises为什么选D? for exercise health good morning your doingfor exercise health good morning your doing is very求解 连词成句 ＿＿＿is good for your body.A.Do exercise B.Doing＿＿＿is good for your body.A.Do exercise B.Doing exercise C.Doing exercises D.Do exercises they like doing exercise根据doing exercise 提问? ______ is good ______ your health.A.Do eye exercise,for B.Doing exercise,for C.Do eye exercises,to D.Doing eye exercises,to go to exercise是什么意思 Doing sports___ (ttcavseiii) means exercise. doing morning exercise加不加S Doing eye ＿＿（exercise）is good for your eyes.