Do you know how often he ____（锻炼）?He is so strong.exercise用加

How do you know he is depressed? h how often does he exercise?how often do he exercise? my brother often do exercise.he gets s（）首字母填空?是strong还是stong How often does he ___（exercise）? How often do you exercise? how old is he?do you know?2并1 do you know how old_______ ___ Then how do you know he is happy? 英语括号部分改错（He） is not（ strong ）.He （can） do exercise （well）. 为什么是Do you know how old he is而不是he is? Then how do you know he is happy（翻译中文） How does he go to school ?Do you know?合并为一句 Do you know ____ how often do you exercise用英语怎么说