What are you talking about / Do you know how to do it? 他们在说什么？What are they talking about? (lit. They be talk what?) 你在说什么？ What are you talking about? (lit. You be talk what?) 你会做吗？ Do you know how to do it? (lit. You can do ma?) 我会做。I know how to do it (lit. I can do) 他们会做。 They know how to do it (lit. They can do) 你会做。 You know how to do it (lit. You can do)