English as a second language; ESL; TESOL ; Pragmatics, contrastive; Pragmatik, kontrastive; Contrastive pragmatics ; Ethnopragmatik; Ethnopragmatics; Culture-specific communication ; Refusal; Ablehnung; Overrule; Apodioxis; Delegitimierung; Delegitimization; Rejection (communication research) ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; English ; Persisch; Neupersisch; Persian