Longitudinal study ; Grammatizität; Grammaticalness ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Rule (language acquisition) ; Williams syndrome ; Language intervention; Children (speech therapy with) ; Speech therapy for children ; Imperfekt; Imperfect; Imparfait; Preterite; Indefinido; Past tense ; Unregelmässige Verben; Irregular verbs ; Rule (morph.) ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English
