Longitudinal study ; Strategie (pragm.) ; Strategy (pragm.) ; Speaker strategy (pragm.) ; Speech-act type ; Erstspracherwerb; First language acquisition; Ontogenese; Language acquisition ; Metalinguistic awareness (in children) ; Phonics (teaching of) ; Phonologische Bewusstheit (bei Kindern) ; Phonological awareness (in children) ; Focus on form (language teaching) ; Sprachbewusstsein (bei Kindern) ; Linguistic awareness (in children) ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children