 It is crucial that when I consider the hypothesis that the Twin-Earthly (or any other) scenario is actual, and ask whether, in that case, my thought that lakes contain water is true, I am not asking whether, had a Twin-Earthly world obtained, lakes would have contained water. The answer to that question is “no,” but it is a different question. When I ask this latter question, I am considering the Twin-Earthly world as counterfactual. Presupposing that the world is not actually that way, I ask what would be true if it were that way. Such questions, in which we consider alternative worlds as counterfactual, are the appropriate way to determine issues of metaphysical possibility. The sort of question relevant to epistemic possibility is different. It involves considering scenarios as actual, not as counterfactual: seeing what is the case if the world is that way, not seeing what would be the case if the world were that way. Questions about epistemic possibility, in which we consider scenarios as actual, are naturally posed in indicative conditionals: if the substance in the lakes is XYZ, is it water?