Simulation theory; Theory theory; Other minds ; Co-construction (communication research) ; Alignment (communication research) ; Cooperative activity (communication research) ; Vagueness (communication research) ; Explicitness (communication research) ; Implicitness (communication research) ; Uncertainty (communication research) ; Play (communication situation) ; Child language (conversational analysis) ; Kindersprache (pragm.) ; Conversational analysis (child language) ; Play (function in language acquisition) ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development ; Holländisch; Dutch