Aristotle is a substantial form

  What for Aristotle is a substantial form? (How does Aristotle’s conception of a substantial form differ from Plato’s conception of an object that instantiates a form,?) What, for Aristotle is the substantial form of a human being? How are health/fitness and moral goodness related to Aristotle’s conception of the substantial form of a human being? What for Aristotle is the well-being of the soul? How is the well-being of the soul related to virtue? Why is it that Aristotle thinks that misfortune can blemish a happy life, but that it cannot make an otherwise good life miserable?