concentrate [concentrated, concentrating, concentrates](bring to, or direct toward, a common center) verb [UK: ˈkɒn.sən.treɪt] [US: ˈkɑːn.sən.ˌtret]He's concentrating, isn't he? = Si sta concentrando, vero?
focus [focussed, focussing, focusses](make (a liquid) less diluted) verb [UK: ˈfəʊkəs] [US: ˈfoʊkəs]He was focused. = Era concentrato.