 The word “you” refers to a different person, depending on the conversational context in which it is uttered; in particular, it depends on the person one is addressing. Other context-sensitive terms are gradable adjectives like “tall”—how tall something must be to count as “tall” depends on the conversational context—and quantifiers like “everyone”—which people count as part of “everyone” depends on the conversational context. Contextualists about “knows” think that this verb belongs on the list of context-sensitive terms. A consequence of contextualism is that sentences containing “knows” may express distinct propositions, depending on the conversational contexts in which they’re uttered. This feature allows contextualists to offer an effective, though not uncontroversial, response to skepticism. For a more thorough overview of contextualism and its bearing on skepticism, see Rysiew 2011 or Ichikawa forthcoming-b.