Good evening, everyone. Język polski jest bardzo trudny, but I took the decision to learn it, and I won't give up. I'm learning Polish on the internet and with a very useful grammar whose title is "Teach Yourself - Polish", made in the '60. But let's come to the point. In a sentence like World Games to impreza organizowana od 1981 roku... why is "to" used, with the nominative case? Could you please explain me when and how I have to use this structure (and why it lacks the verb "to be", jest), and when instead I should use the normal construction with the verb 'być' and the instrumental case? Is it just a matter of grammar or of formal/informal speech too? Przepraszam, pomagajcie mi! Dziękuję! A not-so-clever italian guy.