Word frequency effect (psycholing.) ; Versprecherhäufigkeit; Speech error rate; Frequency (psycholing.) ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Deviation (child language) ; MLU; Mean length of utterance; Sentence length (child language) ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Synalepha; Synaloiphe; Fusion (phonol.) ; Coalescence (phonol.) ; Contraction ; Satzkomplement; Objektsatz; Konstituentensatz; Constituent clause; Complement clause ; Infinitive constructions ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English