"What do you like?"
Translation:Cosa Le piace?
Actually, like in other Romance languages, there is a word for "formal you". It is used when talking to an older stranger or someone you respect. In Italian, the word for formal you is Lei (not to be confused with lei, which means "she" as you already know). When writing it, you always capitalize it. I'm not sure how to tell the difference when speaking because I am not a native speaker. I also think, when you conjugate a verb for Lei, it is the same as lei or lui (at least that's how you do it in Spanish). Hope I could help!