Error analysis (language teaching) ; DaF; Deutsch als Zweitsprache; German as a second language; DaZ; German as a foreign language ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; Frequency (synt.) ; Word class frequency ; Zweitspracherwerb (Textproduktion) ; Second language acquisition (text production) ; Text production (second language acquisition) ; Transfer (second language acquisition) ; Transfer (Zweitspracherwerb) ; Cross-linguistic influence (second language acquisition) ; Interference (second language acquisition) ; Indefinite pronoun ; Personal pronoun ; Possessivadjektiv; Possessive adjective; Possessivartikel; Possessive article; Possessive pronoun ; Reflexive pronoun ; Relative pronoun ; Pronoun syntax ; German ; Swedish