Switch Reference and Universal Grammar

Canonical switch-reference is an inflectional category of the verb, which indicates whether or not its subject is identical with the subject of some other verb. Switch-reference may be analyzed from a structural or a functional point of view. Functionally, switch-reference is a device for referential tracking. Formally, switch-reference is almost always a verbal category, similar to the familiar category of verbal concord. In most languages switch-reference marking is indicated by a verbal affix