The only way is what Mara wrote in her answer.

A good explanation of this and related topics is here:

<a href="http://www.treccani.it/enciclopedia/concordanza_%28La-grammatica-italiana%29/">http://www.treccani.it/enciclopedia/concordanza_%28La-grammatica-italiana%29/</a>;

I would say that to be a subject not really difficult, but with so many details
that you offered me an opportunity to review it for my own sake.
Thank you!