Epistemology Assignment

For the following questions, answer based on the philosophy of Rene Descartes, David Hume, and Immanuel Kant. You should have one paragraph (at least five sentences per philosopher per question, which means nine paragraphs in total (these are minimums, so you are welcome to go longer if you don't feel you can respond in a paragraph).

How can we know anything? How can we know that we know? What can we know with certainty?