Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Deviation (child language) ; Lemmata ; Auxiliary ; Deviation (morph.) ; Root infinitive; Infinitive (morph.) ; Underspecification (morph.) ; Agreement (gramm.) ; Anti-agreement; Grammatical agreement ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English
