My recommendation is to master the basics of standard English FIRST, before you try to use slang and other informal language. I think many of you negatively impact your learning for the sake of trying to sound informal and it’s really not that important. Sounding informal should not be a priority. It’s MORE important to speak and write correctly, even if you sound formal. You’ll have plenty of time to experiment with more informal language once you’re more comfortable with English overall.
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