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In a official letter

If u write a letter to an officer by Designation

If the letter is addressed to the head of a institution where the name is not known

if he /she is not a friend

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Wiki User

14y ago
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AnswerBot

1mo ago

You use "sir" as a polite and formal way to address a man, particularly in customer service, formal settings, or when showing respect or deference.

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Q: When do you use 'sir'?
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