Republik Korea; Korea; South Korea ; Evaluation criterion (language teaching) ; English as a second language; ESL; TESOL ; Komplexität (kognitive) ; Complexity (cognitive) ; Multitasking; Cognitive complexity ; Ingroup communication ; Classroom communication; Instructional communication ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; Questions; Interrogative sentence ; English