Syntactic development; Morphological development; Morphologie (Spracherwerb) ; Syntax (Spracherwerb) ; Grammatical development ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Minimalist program; Generative theory of language ; Pronoun syntax ; Syntax (Theorie) ; Syntactic theory; Theory (synt.) ; English