英文写一篇不上晚自习的请假条原因为有事,包含请假条要素即可字数多一点点

Teacher ,I have a problem about my home ,my grandma has a hight fever,it's very serious,I must go to buy some medicine for her,because my parent go on business,and my grandma come here and take a care to me,but now, she sick,so I will care her now,I must go home ,and bring her go to hospital,so I don't go to evening self-study ,I hope you can understanding that my worry,please let me go home,Thanks~