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,

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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,

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