Reprints ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Deviation (child language) ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Morbus Down; Mongolismus; Trisomie 21; Down's syndrome ; Anomaly (synt.) ; Nonsense sentence; Deviation (synt.) ; Argument structure; Argumentstruktur; Experiencer; Benefactive; Thematic role ; Verb valency ; English