英语语法问题maintain和keep区别是什么?eg：1.doing morning exercises every

Doing morning exercises can keep healthy.这句话对吗? 改为同意句 1.I spend half an hour doing morning exercises every d He ( )morning exercises every morning 英语keep短语问题keep sb doing sth 和 keep sb from doing sth 的区别! Kitty is doing morning exercises.She wants to keep herself f Doing morning _____(exercises\exercise)is a good way to keep 134. Every day he does morning exercises to keep himself h__ We need to do morning exercises every day to keep in good __ 完形填空Doing morning exercises is good for our health.Every mor exercise 和 exercises的区别?do morning exercises是做早操?do morning My sister exercises in the park every morning .你说把exercises和 keep on doing 和keep doing 的区别