You're in Brazil-- what do you care how each region of the US pronounces that 'flap-t'? In conversation (you have produced no sentences), it is basically a /d/ sound between two vowel sounds or liquids ( /l/ or /r/). If you can manage that, you'll sound like a native.
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KooyeenI've heard "getting" pronounced as "getn" pretty often. But in that case "eating" and "eaten" would be pronounced the same.True, but (trust me) you don't want to use that pronunciation for -ingwords (except to be humorous).