Correspondence (source) ; Individual sources ; HCOS ; Corpus of Scottish Correspondence ; Frequency (synt.) ; Sprachwandel (synt.) ; Syntactic change ; Transfer (languages in contact) ; Adstratum language; Adstratsprache; Interference ; Lemmata ; Auxiliary ; Personal pronoun ; Interference (synt.) ; Syntax, contrastive; Syntax, kontrastive; Contrastive syntax ; Deklarativsatz; Declarative sentence ; Agreement (gramm.) ; Anti-agreement; Grammatical agreement ; Clitics ; Northumbrian ; English (British) ; Grossbritannien (engl. Sprache in) ; Great Britain (English language in) ; Englisch in Grossbritannien; English in Great Britain; British English ; Scots; Scottish (English in Scotland) ; Schottisch (Englisch in Schottland) ; Scotland (English language in) ; Schottland (engl. Sprache in) ; English in Scotland ; Old Scots ; Middle Scots