Language teaching ; English as a second language; ESL; TESOL ; Lehrplan; Instructional advice ; Gesichtsverlust; Mitigation (pragm.) ; Abschwächung (pragm.) ; Cross-cultural pragmatics; Pragmatics, cross-cultural; Pragmatik, interkulturelle; Intercultural communication ; Phatic communication ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; English