Answer:
I have three feet but I cannot walk. What am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
Forward I am heavy backward I am not. What am I?
What loses its head in the morning but gets it back at night?
Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?
I flow from the Homerβs mouth when he sees doughnuts.