Would it be wrong to say "mostrou" in this sentence?
No, if you mean the action is over by now ;)
now all of a sudden the adjective comes before ? as in good results : bons resultados.. how is it not resultados bons.. like so many other situations ! ?
"Bom" and a few other adjectives are usually placed before nouns. By the way, using "dado" instead of "mostrado" makes the sentence sound more natural.
thanks as always.. you da man ! : )
Shouldn't this be either ‘has been showing’ (en) or ‘monstrou’ or maybe ‘deu’ (pt) ?
yes, 'Deu" or "tem dado" works better.