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

Having a good diet is very important.Doing exerci 1.He was busy checking exercise books all the morning,only ____ occasionally to have some tea.(only 的用法有哪些）A:stopping B:to stop C:stopped D:having stopped2.My brother is working on building up his body _____ by doing some special exerci doing morning exercise加不加S what is she doing this morning? what does he like doing the morning.. The______is doing some______.She often______on Sunday morning. what were you doing this morning还是what are you doing this morning Doing morning exercises can help us get -------- for the day What were you doing at this time yesterday morning? doing morning exercises --------(be) good for our health good morning what are you doing am studing Doing morning exercises is good for us.（同义句） Doing morning _____(exercise) is good for our health. doing morning execrises is good for your s what are you doing on Monday morning?句型转换 swimming,running and doing morning exercises____you (be good for) My brother_____(don't) like doing morning exercises Doing Morning exercises _____(are) good for us.