Dear Miss/Mr__:I'm sick,I have a cold/a stomaksche/a toothache...,I have to go to the hospital and see a doctor.So today I can't go to school,please allow me.From:_____.
Dear teacher,i have a bad headache,the doctor told me that i should stay at home.i am afraid i couldn't go to class.i want to take a sick leave.Please!
Mr ..... I have illness so I can't go to school tomorrow .but I will back on feet as quickly as I can.I write this message for you and Let you know this !