Well my son has learned Yes, but he doesn't say it, sometimes he'll say YAH!, mostly he just nods. He is just starting to learn to shake his head no. I've been amazed at how much he can communicate. I think he's my most expressive child yet. Here is a video of him answering some questions. I just talk to him all day long in questions cause I love it so much, I'm sure I'll pay for it eventually.