  In the right circumstances, a speaker could use (26) to assert a true proposition. This strongly suggests that (26) is true in some contexts. But ‘that’ is unambiguous, and so has a single linguistic meaning. If linguistic meaning determines reference in a context (in the way that Kaplan’s characters do), then all occurrences of ‘that’ in (26) have the same reference with respect to any given context. So, (26) should be false in all contexts.