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Ask a chatbot for "a formal letter to the editor about potholes" and you will get a neat letter that can still cost you marks in a CBSE English paper, because its layout is often American business style.
Why does AI write formal letters in a different format from CBSE?
A chatbot tends to write the pattern it has seen most often, and much of what these models learn from is the English-language web. In OpenAI's GPT-3 paper, filtered Common Crawl web data made up 60% of the training mix (Brown et al., 2020). In Common Crawl's latest crawl, CC-MAIN-2026-43, about 42.6% of pages are in English and about 0.2% are in Hindi (Common Crawl language statistics).
A 2024 study in PNAS Nexus tested five GPT models and found that all of them gave answers with cultural values resembling English-speaking and Protestant European countries (Tao et al., 2024). That study measured values, not letters, but layout conventions are cultural too. The American business letter described by the Purdue Online Writing Lab puts a colon after the salutation ("never a comma"), a comma after the closing, writes the date as "June 11, 2001", and has no subject line among its parts.
What does CBSE actually mark in a formal letter?
In CBSE's 2026-27 sample paper marking schemes, the letter carries 5 marks and 1 of them is for format, in both Class 10 English Language and Literature and Class 12 English Core. The Class 12 scheme adds two notes: close a letter to the editor with "Yours truly" and a job application with "Yours sincerely", and send the bio-data as a separate enclosure.
CBSE's 2022-23 Class 10 marking scheme lists the format elements: sender's address, date, receiver's address, subject and salutation (in either order), the letter, and complimentary close (CBSE marking scheme, Class 10, 2022-23). Full credit needs all of them; one or two missing earns half a mark, and more than two missing earns nothing.
In the scheme's solved example, every line starts at the left margin, the date reads "29 August 2022", the salutation is "Dear Madam" and the close is "Yours truly", with no comma after either, followed by the writer's name and designation.
AI letter vs CBSE letter: what should you change?
The question says: you are Arjun Mehta, 14 Lake Road, Bhopal; write to the Editor of a daily about potholes near your school. An illustrative chatbot draft, then the fix:
Sender's address. AI: "[Your Name], [Street Address], [City, State ZIP], [Email]". CBSE: only what the question gives, "14 Lake Road, Bhopal".
Date. AI: "November 9, 2026". CBSE model: "9 November 2026".
Receiver's address. AI may skip it. CBSE: "The Editor", the paper's name and its address.
Subject. AI: missing, or "Re: Road conditions". CBSE: "Subject: Dangerous potholes near our school".
Salutation. AI: "Dear Editor:". CBSE: "Dear Sir" or "Dear Madam".
Closing. AI: "Sincerely," or "Best regards,". CBSE: "Yours truly" for the editor, "Yours sincerely" for a job application.
Signature. AI: "[Your Name]". CBSE: the name from the question, plus designation if one is given.
Length matters too. The 2022-23 letter-to-the-editor question asked for "not more than 120 words" (CBSE marking scheme, Class 10, 2022-23). Count the words yourself.
How should you ask AI for a CBSE-format letter?
The PNAS Nexus study also found that "cultural prompting", telling the model whose conventions to follow, improved cultural alignment for 71-81% of countries and territories with GPT-4, GPT-4 Turbo and GPT-4o (Tao et al., 2024). It did not test letters, but the same idea suggests naming the board and the layout. Try this script:
"Check the format of my formal letter for CBSE Class 10 English. The CBSE layout is: sender's address, date as day month year, receiver's address, subject line, salutation 'Dear Sir' or 'Dear Madam', body, closing 'Yours truly' (editor) or 'Yours sincerely', name and designation. List anything missing or in American style. Do not rewrite my content. My letter: ..."
Write your draft first and let the AI check only the format. The other 4 marks go to content, organisation and accuracy, so keep the writing yours: the same feedback-first approach as using AI on your assembly speech without losing your voice. For a real internship application, the business layout may be exactly right: see how to write a cover letter for an internship.
A 60-second format check before you submit
Sender's address from the question only, no placeholders.
Date written day, month, year.
Receiver's designation and address.
A subject line that says what the letter is about.
"Dear Sir" or "Dear Madam", no colon.
The right close for the letter type.
Your name, and designation if given.
Job application? Bio-data as a separate enclosure.
For notice format and the Class 12 letter types, see our guide to English writing section formats for Class 12. If the letter is one slot in a revision day that also has physics or maths, Fermi's AI tutor can work out what you already know in those subjects and build a plan for the session.
