This course is study of the key fundamental problems in metaphysics. What is a thing? Is it the same as what it is made of? What is the difference between a thing a property? What kind of thing is a cause? Do necessity and possibility exist, like things, or what is their status in the world of being? Possible worlds. In what way do space and time exist? Persistence through time: does anything endure? Do space and time have a beginning and an end? What is the relationship between the mental and the physical? Freewill. The problem of universals: does anything universal exist, or is everything a particular? Prerequisite: A course in philosophy.