When drafting a letter to the principal for an extension of sick leave, it's crucial to maintain clarity and politeness. Clearly state your name, class, and roll number, along with the dates of your previous sick leave. Explain the reason for requesting an extension and specify the duration of the extension needed. End the letter with a polite request for the principal's consideration.
Application for Extension of Sick Leave - Request Letter to Principal Seeking Extension of Sick Leave
To,
The Principal,
_________ (Name of the School/Institution),
_________ (Address of the School/Institution)
Subject: Application for Extension of Sick Leave
Respected Sir/Madam,
With due respect, my name is _________ (Name of the Student) and I study in class _____ (Class of the Student), having Roll Number _____ (Roll Number).
I was on sick leave for ____ (number of days) days from __________ (Date) to ________(Date). Humbly, I would like to state that I need an extension in sick leave granted duration from _______ (Date) to ________ (Date) due to ___________ (sickness/not fully recovered/prescribed bed rest/health issues)
If you could please consider my situation and issue me an extension in sick leave for ________ (number of days) days, I would be really very obliged.
Yours Faithfully/Sincerely,
__________(Name of the Student),
__________(Class),
__________(Roll Number)
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Sandeep Bhandari 
Deepanshu Thakral