Many studets get tired because they have to do too much homework.And thet（拼錯了they） have no time too (改為to) do exercise,(這兒算一句結(jié)束.)so(大寫So,開始另一句) ,(刪掉這個逗號)they can't get good（改為high） grades,and they are not strong.I think it is very important to stay healthy,it（這兒最好重新開始另一句.It） depends on how often you do exercise.Our school has many kinds of sports (運(yùn)動項目不能這么說,建議改為sportsequipment運(yùn)動器材,因?yàn)槟愫竺娴那蚨妓闫鞑? like（suchas） basketball,volleyball and soccer.We often play sports(做運(yùn)動不能這么說,改成doing exercise) in school.We can （要加一個do在這兒）exercise in P.E class.I think it is good for our health.It helps me too (又寫錯to) keep healthy.I hope we can have a lot(刪掉) more time to do sports.