Grammaticalization and deflexion in progress. The past participle in the Old English passive

This article deals with the Old English adjectival construction that consists of the copulative verb beon to be' and the past participle. Grammaticalization is gauged as to the agreement between the subject noun phrase and the past participle and from the perspective of deflexion, which is considered the final stage of grammaticalization. The highest rates of agreement are found in aelfrician texts and translations from Latin, while other texts like the Anglo-Saxon Chronicle not only evince remarkably lower figures of agreement, but also show a decrease over time. The conclusion is reached that, although the grammaticalization of the past participle in passive constructions is not complete on the basis of deflexion, the process is well underway in Old English.