What's Necessary to Negate Something That's Not True?

This isn't about adding on or affirming anything. It's about negating something that isn't true. This is a negation of it. So there you go. I can sell some food cooking in the next room. All right, anyone else? What time is it? No. Oh, hey. Where's Amelia? Where is she? In thenext room. She's cooking up.