Answer:
What English word retains the same pronunciation, even after you take away four of its five letters?
Talks like this, a green wise man does. Guess my clue, you will.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
I am your mother's brother's only brother in law. Who am I?