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Hi evryone, When is it appropriate to use the word guy? Thanks.
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Use "guy" only when speaking or in informal writing. Don't use it in things like academic essays. It's an informal word.
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it is still more used in the US thanthe UK -

in the UK, if you address a crowd as "you guys", people are likely to think you are being playful with language - it doesn't sound serious at all to most of us!
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Comments  
One use would be to refer to a man as in " I miss my guy".
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