How often do they exercise什么意思

how often do they have ball How often do they exercise什么意思 How often do they do to school by bike? 英语.how often do they stay uplate 为什么助动词英语.how often do they stay uplate 为什么助动词用do? How often do they eat in a week? how often do they do exercise?=_____ ________do they _________? how often do they do exercise?=_____ ________do they _________? Parents often ask their children ----- they do in their school A what B what do C how do D thatParents often ask their children ----- they do in their schoolA what B what do C how do D that how often do you miss How often do you exercise? how often do you exercise? How often do you shop how often do you go How often do you eat How do you often swim? How often do they go to school by bike 汉语意思? And how often do they haveball games Four times a year 汉语意思 How often do they have ball games?介绍一下语法特点.