“…Research on discourse markers generally presents five representative perspectives: (1) Coherence model (e.g., Schiffrin, 1987 , 1994 , 2003 ; Chen, 2002 ; He and Mo, 2002 ) explores the role of discourse markers in displaying the semantic coherence between discourse segments and the discourse coherence mode; (2) Relevance model (e.g., Blakemore, 1987 , 2002 , 2011 ; Ran, 2002 ; Shan, 2014a ; Li et al, 2018 ) focuses on relevant inference, studying how speakers use discourse markers to guide or restrict listeners to find relevance between discourse segments; (3) Syntactic-pragmatic model (e.g., Fraser, 1987 , 1999 , 2009 , 2015 ; Akar and Öztürk, 2020 ) examines the syntactic features and pragmatic functions of discourse markers, arguing that the function of discourse markers is to guide the listener to correctly interpret the logical relationship between the preceding and following discourse segments; (4) Grammaticalization/pragmaticalization model (e.g., Fang, 2005 ; Wu, 2005 ; Maschler, 2009 ; Dong, 2010 ; Li, 2014 ; Fedriani and Sanso, 2017 ; Tanno, 2018 ; Rhee, 2020 ) probes into the evolution of discourse markers and the contributing factors behind this; (5) Prosody-pragmatics model (e.g., Hirschberg, 2002 ; Matzen, 2004 ; Braga and Marques, 2004 ; Wichmann et al, 2010 ; Beňuš, 2012 ; Abuczki, 2014 ; Cabarrão et al, 2015 ; Gonen et al, 2015 ; Volín et al, 2016 ) draws on prosody as an objective factor to identify and characterize discourse markers or as an immediate and readily accessible feature to reveal the functions of discourse markers and how people comprehend them. Some of these studies have shifted from the traditional syntactic-semantic perspective to the pragmatic-cognitive or even prosodic dimension.…”