英语作文改错!请指出语法错误和用词不当等错误

My name is li,a Grade 3 student.After I came into grade 3(中式英语.用recently即可),I found that a part of（改成some,这里不涉及整体和局部的比较） students always stay up for（to） study..Therefore,they can't get up early the next morning,and have no time to eat breakfast in time.I think this behavior（和this重复,删去） maybe do harm to theirs body（删掉,英语中的健康一般指的是身体） health,it is really unhealthy,and will causes（改为cause.will之后只用原形） many bad results.Although we are in grade 3,a（改成an 错得不应该啊.） important stage,we can't do harm to our health.We should go（加to!） bed early and get up early.Keeping a good state.Everything makes sense only with（改为when we are） health（healthy）.
拙见,供参考.