IDENTIFICARE LA GENTE e CHIEDERE L'IDENTITÁ

Excuse me, are you Mary Brown?
Yes, I am / yes I am, I'm Mary Brown

Are you Sam Smith?
No, I'm not.
No I'm not. I'm not Sam Smith

Who's that ? Quella/ quello chi è?
That's Barbara 
It's Barbara

Look, is that Francis ? Guarda, quello è Francis?
Yes, it is 
Yes, it's Francis
No, it isn't (is not) = no, it's not (it is not)
No, it's not Francis