If you would like to apologize for not being able to submit your assignment, here is a sample apology letter for not submitting an assignment.
Subject: Apology for Not Submitting Assignment
I am writing this letter to express my regret at not submitting the [subject] assignment on time for this month.
I understand you gave us adequate time to carry out the research and prepare for the assignment. However, I had to travel out-of-town with my family due to personal commitments. Since it was an unexpected incident, I did not have the sense to inform you of the same.
I have done part of the assignment and can show you the same. But I did not find enough time to finish it, due to which I could not submit. I kindly request you to understand my situation and grant me a 5-day extension.
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