Casual words and slang as well as the light, conversational tone should be avoided in a business letter.
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Personal pronouns “I” and “we” have the same meaning when writing a business letter.
Letters are generally divided into business letter and personal letter.
In a question and answer session, as a speaker, if you don’t know the answer to a particular question, just ignore the question and move on to the next one.
When a questioner raises an improper question, you should keep silent rather than say something rude to the questioner.