Can Gupta Secure Singular Reference?

Empirical thought would be impossible without singular reference in presence, that is, when the reference is anchored by an experience through which a single object is presented to the subject. But I think Gupta has difficulty securing such reference. In this short note I highlight this difficulty by raising some problems for his treatment of an example important to him (“the Main Twin Example”). I think these problems are ultimately rooted in his sharp separation between experience and thought, but argument for this diagnosis would require a longer discussion.