Wh-questions like What is your plan? and Which is your plan? differ in terms of the notion of D-linking. Unlike the answer to the What-question, the answer to the Which-question is supposed to be drawn from a set of individuals previously introduced into the discourse. If what and which are syntactic atoms with no internal syntax, their observed semantic difference, and therefore the D-linking
... [Show full abstract] semantics, too, must be lexical in origin. However, there is no a priori reason why the origin of D-linking should, as a UG property, be lexical. In this squib, the A. argues that UG permits the possibility that D-linking is instead a syntactic phenomenon. More specifically, he argues that the D-linking semantics can arise through the local binding of pro by the (null) interrogative operator. He bases his argument on two genetically and geographically unrelated languages, Japanese and Plains Cree. The emerging picture is that as far as D-linking is concerned, the semantic difference between the two wh-questions can be reduced to the type of the constituent that the interrogative operator binds