Since Since Kai

• The Perfect introduces a time interval: the “perfect time span” (PTS). • The Right Boundary (RB) of the PTS is set by Tense. • The Left Boundary (LB) of the PTS may be set by “perfect adverbials”. • The lower predicate (event) is predicated of the PTS, either directly or mediated by various devices, most notably operators associated with the Perfective or Imperfective. • When the predicate has the subinterval property, either because of its inherent properties or because it is a derived stative/progressive, we obtain the Universal Perfect (U-Perfect). ∗The authors are listed in alphabetical order. We have presented this material to audiences at MIT and at Sinn und Bedeutung 6 in Osnabrück. We thank those audiences and Danny Fox, Irene Heim, Arnim von Stechow, Ede Zimmermann for helpful comments. We thank David Pesetsky for suggesting an alternate title: “The Preposition Formerly Known as Since”.