Given your updated preferences i have devised the following outline for your Email : 

Subject: Request for Extension on Homework Submission

Dear [Teacher's Name],

I am writing this email to request an extension on the submission deadline for the homework assigned on [date]. Unfortunately, due to unforeseen circumstances, I won't be able to complete it on time.

I understand the importance of submitting the homework on time and I apologize for any inconvenience that this may cause. I tried my best to complete the work on time, but [provide a specific reason for not completing the homework, such as a family emergency, illness, or any other valid reason].

I would be very grateful if you could grant me an extension of [provide a specific time frame that you require for submission] to complete the homework. I assure you that I will submit the completed assignment as soon as possible.

Thank you for considering my request, and I appreciate your understanding in this matter. Please let me know if there are any additional requirements that I should fulfill to receive an extension.

Sincerely,
[Your Name]

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