Error analysis ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Pathologischer Spracherwerb (phon.) ; Phonological development (pathol.) ; Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Motor speech disorder; Sprachpathologie (phonet.) ; Language pathology (phonet.) ; Artikulation (pathol.) ; Articulation (pathol.) ; Case study (pathol.) ; Language intervention; Children (speech therapy with) ; Speech therapy for children ; English ; Mandarin; Kantonesisch; Cantonese; Putonghua; Sinitic; Hakka; Yue; Chinese