New arguments for verb cluster formation at PF and a right-branching VP: Evidence from verb doubling and cluster penetrability

This paper provides new evidence that verb cluster formation in West Germanic takes place post-syntactically. Contrary to some previous accounts, I argue that cluster formation involves linearly adjacent morphosyntactic words and not syntactic sister nodes. The empirical evidence is drawn from Swiss German verb doubling constructions where intriguing asymmetries arise between ascending and descending orders. The approach additionally solves the cluster puzzle with extraposition and topicalization, generates all of the crosslinguistically attested six orders in the verbal complex and correctly predicts which orders are penetrable in which positions. On a more general level, the paper provides arguments for a derivational treatment of verb cluster formation and order variation and adduces important evidence in favor of a right-branching VP.