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Different situations requires different kinds of speech
When you're with your friends, it's okay to be loud and use slang. They'll expect it and they aren't grading you on your grammar. When you're standing in a boardroom or sitting for an interview, you should use your best English possible, and keep your tone suitable to the working environment. Try to gauge the personality of the interviewer and the setting of the workplace before cracking jokes or speaking out of turn. If you're ever in a position to speak publicly, always ask about your audience, and modify your language, tone, pitch and topic based on what you think the audience's preferences would be.
What is the main idea of this passage?
Different situations require different kinds of speech