Discourse marker ; E-Mail; Voice mail; Chat; Computer-mediated communication ; Alternation (biling.) ; Language shift (biling.) ; Sprachwechsel (biling.) ; Mixed language ; Second language acquisition (pragm.) ; Zweitspracherwerb (pragm.) ; Interactionist hypothesis (second language acquisition) ; Conversational analysis (second language acquisition) ; Hongkong (engl. Sprache in) ; Hong Kong (English language in) ; English in Hong Kong ; Mandarin; Kantonesisch; Cantonese; Putonghua; Sinitic; Hakka; Yue; Chinese