Dear Mr/Ms XXX：
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,
XXX
1.英文中请假条的写法和汉语请假条相同，它一般由四部分组成，即时间、称呼、正文和签名。
2.一般而言，可认定请假条是一种简单的.书信文体。请假条一般写在纸上，不用信封。其书写格式与书信有很多相似之处，是书信的大大简化。
3.请假条的特点是要求开门见山、内容简短、用词通俗易懂。
Dear Mr/Ms Jiang：
I was unable to come to 1st and 2nd period today.Due to the rain yesterday, I was wet and had temperature at night. The doctor adviced me to rest for several days and after my recovery, I will attend school as soon as possible.
I am sincerely sorry about the inconvenience. However, I would like to have your permission. Also, afterwards I would phone you and there's the certificate by the doctor.
Li Tie
October 21st 20xx