Formal Letters Format

Beginning and ending:

1. Dear Sir or Madam, Yours faithfully

2. Dear Mr. Smith, Yours sincerely

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First sentences, stating the purpose of the letter:

I am writing with regard to 

I am writing to request/ to ask for 

I am writing to thank you for 

I am writing to inform you that

I am writing to inform you of my decision to 

I am writing to complain about

I am writing to bring to your attention

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On behalf of all of my colleagues, I would like to thank you for 

Thank you for your help and support.

I look forward to receiving your response. 

I await your prompt response.

I hope that you will address these concerns as soon as possible. ( Complaint )

Please let me know if you require any further information. 

I hope that my request does not cause you any inconvenience.

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Three tips: 

Avoid contractions: " I am " instead of "I'm"

Avoid direct questions: "I would like" instead of "Can I have?"

Avoid exclamation marks "!"