A: Did you wipe your feet? B: Yes, of course I wiped my feet.A: Then why is there mud on the carpet?B: I don’t know. It’s not my mud.A: Well, someone brought it into the house.B: Look at the bottom of my shoes—they’re clean.A: Of course they’re clean. You left all the mud on the carpet.B: Okay, I’ll get the vacuum cleaner.A: Don’t vacuum it now.B: Don’t you want me to clean up the mud?A: Wait till it dries. It will be easier to vacuum.B: Next time I will be more careful.