Letter: Form

Letters should adhere to a structured format with an opening, body, and closing section.
Begin your letter with an introduction, where you establish your point of contact or reason for writing.
The body of the letter should convey your main message or request. Break it up into manageable paragraphs with each focusing on a single topic or argument.
Resolve or summarise your communication in your conclusion. Indicate any required follow-up actions.
Back your points up with facts or personal experiences where suitable for the situation.
Include a formal salutation and closing phrase. ‘Dear’ is typically used for the salutation and ‘Yours sincerely’ or ‘Yours faithfully’ for the closing.

Letter: Tone

Maintain a consistent tone throughout your letter. It can range from formal to informal, depending on the recipient and purpose.
Display respect and politeness to the reader irrespective of the tone of your letter.
Even when expressing displeasure or presenting a complaint, keep your tone professional and calm. Avoid the use of offensive or confrontational language.
Be precise and concise. Convey your points in a straightforward manner without unnecessary embellishment.

The register of your letter will be determined by its purpose and the recipient. It can range from a semi-formal to a formal style.
Use appropriate language that aligns with the register. Formal letters should avoid the use of slang, jargon, or colloquialisms.
If the letter is addressed to someone you have an established relationship with, a conversational or semi-formal register may be effective.
Ensure your register is consistent from the beginning to the end of your letter. An abrupt shift in register can confuse the recipient or undermine your message.