Answer:
What wears a coat in the winter and pants in the summer?
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
What has four wings but cannot fly and uses the wind but does not know why?
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
What is always coming but never arrives?