In Chinese, there are no significant differences when we talk to different people. But we would normally add "please" or showing more respect when we talk to older people and strangers. In some northern parts of China, people use "nin" instead of "ni" to call older people. As for men and women, we have different characters to differentiate them like "him and her", but they sound exactly the same when we speak it out. All in all, despite small differences in expressing respect and differentiate people, there are no other significant differences in terms of grammar and sentence structure.
However, while in work, we do tend to use a more formal and professional language than informal ones. For example, we would use auxiliary or mood particles in casual talk, but never in a business language or formal talk.
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