# WHAT I KNOW WHEN I KNOW A LANGUAGE **Opening (not a real abstract):** EVERY speaker of a language knows a bewildering variety of linguistic facts and will come to know many more. It is knowledge that connects sound and meaning. Questions about the nature of this knowledge cannot be separated from fundamental questions about the nature of language. The conception of language we should adopt depends on the part it plays in explaining our knowledge of language. This chapter explores options in accounting for language and our knowledge of language and defends the view that individuals’ languages are constituted by the standing knowledge they carry from one speech situation to another. The title of this chapter alludes, of course, to Michael Dummett’s seminal paper, ‘What Do I Know When I Know a Language?’ in which he raises many fundamental questions for the philosopher of **Authors:** [[A LANGUAGE]]