My sister exercises in the park every morning .你说把exercises和do erercise都对.
问题描述：
My sister exercises in the park every morning .你说把exercises和do erercise都对.
可是My sister 是第三人称单数可以用do exercise 真的很麻烦,
答
用does
另外关于exercise作（智力的）运用；（尤指）锻炼运动时不可数,比如说：The doctor advised him to take more exercise.(发音,体操,保健,深呼吸,钢琴等)练习,训练时可数,比如说： The teacher set her class a mathematics exercise for homework.还有（部队等的）操练,演习也是可数的,比如说：military exercises军事操练那之前你告诉我说是用do exercise.不过还是很感谢啦