Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Wortbedeutung (Spracherwerb) ; Bedeutungsentwicklung; Semantic development ; 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 (Sprachgedächtnis) ; Children's verbal memory; Verbal memory in children ; Generic usage ; Definiteness; Specificity ; English