As an American, I observe that the Brits use “isn’t it” to express something similar to “fei”. Example: “That’s the entrance, isn’t it?” seems to mean “You thou

As an American, I observe that the Brits use “isn’t it” to express something similar to “fei”. Example: “That’s the entrance, isn’t it?” seems to mean “You thought that that is the exit, did you? You’re an idiot.” The closest we Yanks have is the sarcastic “That’s an exit? Yeah, right.”