Answer:
What has three ways out and just one way in?
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
What is it that given one, you’ll have either two or none?
What can you fold but not crease?
A tiny bead, like fragile glass, strung along a cord of grass.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.