My dear teacher Mr./Mrs.:
I am greatly reget to tell that I will not be able to take your courses for I will go back to my hometown by train this afternoon.
Please forgive me to say those to you and don't worry about my work. I will ask my classmates to help me with it once I am back.
Have a nice holiday!
I am requesting a leave of absence from 27 September to 10 October，2009 for the following reason. My physician has recommended that I refrain from work during this period in order that I obtain sufficient rest before and after the delivery of my child.
While I was hoping to work one week longer than he suggested, I feel that I should defer to his judgment.
Will you kindly excuse my absence from work on Monday morning? 恳请您原谅我星期一上午不能上班。
I am writing to ask for a two-day sick leave.现留言向您请病假两天。
I am awfully sorry that I cannot come to the office today owing to a severe headache.由于我头痛得厉害，非常抱歉今天不能到办公室来。
It may be a few days before I'm able to resume my duties.我有可能要好几天后才能来上班。
My absence during the past three days was caused by a cold and high fever.我三天没有来上班，是由于感冒和发高烧。
I beg to apply for one week's leave of absence from the 6th to 12th instant，both days inclusive.我请求您准许我从本月6日起到12日止(包括这两天)请一个星期的假。
I will take my son to Los Angeles to consult a dentist.我将带我儿子到洛杉矶去看牙医。
On account of my mother's heart disease，I should very much have a leave for a day or two.由于我母亲的心脏病，我实在不得不请1-2天假。
To: Peter Stone, Manager
From: Lynn Chen, Financial Department
Date: April 2nd, 2004
Subject: Casual Leave of Absence
Peter, I would like to know if I could ask for a casual leave of absence for one day on April 4th, this Wednesday.
This morning I received a telephone call from my dentist, urging me to come to his practice for immediate treatment of my teeth. I have been experiencing a stinging pain, depriving me of my sleep during the past fortnight. The situation could worsen, should infection occur.
Concerning my workload: As Wednesday is not as busy as the other weekdays, I think a one-day leave this Wednesday may be the best solution. I apologize for the inconvenience my absence from work may cause.
Thanks. I will call you at 1:30p.m. or you can call me at any time.