In my book there is the text:
I took one of the big trash bags from under the kitchen sink and trudged upstairs. Patches lay on my bed, her tail twitching, eyes blinking, lost in some daydream. What does a cat do on its day off? Can't lie around. That's its job.
I can understand question "What does a cat do on its day off?", but I thought the answer should be "lie around" or something else affirmative. Can you explain to me why in my book there is negative answer to that question?