concern [concerned, concerning, concerns]◼◼◼(to be of importance to) verb [UK: kən.ˈsɜːn] [US: kən.ˈsɝːn]It doesn't concern you. = Ça ne te concerne pas.
regard [regarded, regarding, regards]◼◼◼(to have to do with) verb [UK: rɪ.ˈɡɑːd] [US: rə.ˈɡɑːrd]