Mr ,
I've got a cold and cough badly so I can't go to school. I'm writting to ask for sick leave of two classes.
Encl. Doctor's Certificate of Advice( 病例证明) Your student.
Dear Mr/Ms ;
Today I'm writing to you to ask for a five-day leave, for I've got cold last night with carlessness. This morning my mother took me to see the doctor,who told me to stay in bed for some days. So I am very sorry to be absent from school, especially your interesting lessons. I'll be sure to make up for the missed lessons after I recover from the illness.
Yours ever,
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