Degrammaticalization; Relexification; Transcategorization; Lexicalization ; Sprachwandel (synt.) ; Syntactic change ; Clitics ; Lateinisch; Latin ; Gemeinromanisch; Common Romance; Romance ; Slavic languages ; Altkirchenslawisch; Old Church Slavonic; Neukirchenslawisch; New Church Slavonic; Church Slavonic