Language testing ; Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; Sampling; Language corpus; Sprachkorpus; Datensammlung; Data collection; Textkorpus (method.) ; Text corpus (method.) ; Corpus linguistics ; Worthäufigkeit; Häufigkeitsliste; Frequency list; Frequency (lex.) ; Word frequency ; Listening comprehension ; Second language acquisition (psycholing.) ; Count noun; Singulare tantum; Individuativum; Individualnomen; Massen-Nomen; Collective noun; Mass noun/count noun ; English