DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Topik/Prädikation; Topic/comment; Theme/rheme; Thema/Rhema; Satzperspektive; Given/new; Funktionale Satzperspektive; Functional sentence perspective; Focus/background; Communicative dynamism; Theticity; Information structure ; German