Ask questions or just talk about different languages. Since BrainKing is an international game site supporting many languages, this board can be kind of useful.
Pedro Martínez: very true about native speakers ... if i am not sure about something in dutch i pronounce both possibilities and chose the one which 'feels right' :)
the same when i ponder over the spelling of a word .. i write down both spellings and chose the one which 'looks or feels right' :)