The Title Of This It.. Is It

What is it? what has it got? Is it what it is? Or is it, what it's not? Maybe it is What isn't, a nothing It's a nothing That happens to be a thing Maybe it is and isn't At the same time Maybe this it Is the last it in this rhyme But it's probably not It would be if not were it But it's most likely something Entirely different Can it be anything? Some say that's absurd But my mind tells me It could even be a verb