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You raise some interesting points @Vale , thank you. Especially regarding understanding the right context when slang is appropriate. I also agree that it is much easier to passively know slang than to use it (although, this is probably true of any vocabulary – first we need to recognise it, then learn it, then produce it – it’s a process!)
A few notes:
> like AT THE office or IN ANY professional situation that requireS a formal attitude.
> an high level of English’s knowledge > a high level of English knowledge
