Transfer (psycholing.) ; Articulatory suppression; Interference (psycholing.) ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Differenzierung (Zweisprachiger Spracherwerb) ; Differentiation (bilingual language acquisition) ; Language differentiation (bilingual language acquisition) ; Wortstellung; Satzfolge; Serialisierung; Serialization; Word order ; Null subject; pro-drop; Subjectless clause ; German ; Italian