【帮忙看一下这篇英语作文写得有没有不对的地方?Manystudetsgettiredbecausetheyhavetodotoomuchhomework.Andthethavenotimetoodoexercise,so,theycan'tgetgoodgrades,andtheyarenotstrong.Ithinkitisveryimportant】

　　帮忙看一下这篇英语作文写得有没有不对的地方?

　　Manystudetsgettiredbecausetheyhavetodotoomuchhomework.Andthethavenotimetoodoexercise,so,theycan'tgetgoodgrades,andtheyarenotstrong.Ithinkitisveryimportanttostayhealthy,itdependsonhowoftenyoudoexercise.Ourschoolhasmanykindsofsportslikebasketball,volleyballandsoccer.Weoftenplaysportsinschool.WecanexerciseinP.Eclass.Ithinkitisgoodforourhealth.Ithelpsmetookeephealthy.Ihopewecanhavealotmoretimetodosports.

　　这篇作文是考试时候写的,老师也没仔细改,想知道有没有写错的地方,谁能帮帮啦?