DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Lehrplan; Instructional advice ; Written/spoken language ; Discourse analysis (pragm.) ; Diskursgrammatik; Gesprächsanalyse; Konversationsgrammatik; Conversational analysis (pragm.) ; Classroom communication; Instructional communication ; Anleitung; Commands; Anweisungen; Instruction ; Abtönungspartikel; Modal particle ; Modal verb ; Modality ; Tense (synt.) ; Discourse analysis (text.) ; Text analysis ; German