If you know the name of the person you are writing to, start your letter by using Dear Mr (for a man), Dear Mrs (for a married woman), Dear Miss (for an unmarried woman), or Dear Ms (for an unmarried woman or where the marital status is unknown), followed by the surname, for example: Dear Mr Smith, Dear Mrs Jones, Dear Miss Richards, Dear Ms Shepherd, If you don't know the name, start with one of the following: Dear Sir, Dear Madam, Dear Sir or Madam, Here are some examples of things you might say in a formal letter: I am writing in reply to your letter of 4 September regarding your outstanding invoice. Further to our conversation, I'm pleased to confirm our appointment for 9.30am on Tuesday, 7 January. I would be grateful if you could attend to this matter as soon as possible. If you would like any further information, please don't hesitate to contact me. If you would like a reply, you can use the following sentence at the end of your letter: I look forward to hearing from you. If you started your letter with Dear Mr, Dear Mrs, Dear Miss, or Dear Ms, you should finish your letter with the following expression: Yours sincerely, However, if you started your letter with Dear Sir, Dear Madam, or Dear Sir or Madam, then use the following: Yours faithfully, Add your signature at the end, followed by your full name printed.
This is formal letter
                                                                                               (place you live).
(your name),
(fathers name),
(your address).
   SUB : ----------------------(briefly abt your pupose of the letter)-----------------
Respected sir / madam,
                                              Thanking you,
                                                                                                 yours truly,
                                                                                                 (your name)