English as a second language; ESL; TESOL ; Unterbrechung (Diskursanalyse) ; Interruption (conversational analysis) ; Dialogsteuerung; Alternation (pragm.) ; Sprecherwechsel ; Classroom communication; Instructional communication ; Teacher talk; Teacher's language ; Yes-no question; Polar question ; English (American) ; USA (English language in the) ; USA (engl. Sprache in den) ; English in the USA; Englisch in den USA; American English