In the process of communication, different expressions in discourse often convey unequal amounts of information: some expressions have rich semantic content, expressing the specific message that the speaker wishes to convey; others seem to be nonsemantic and non-truth-conditional. The latter are not part of the propositional content the message conveys and do not contribute to the meaning of the proposition. These expressions mainly function as a relational operator to connect the propositions in the discourse.
In a sequence of discourse segments S1–S2, such expression usually occurs at the initial position of S2 followed by a phonological break (a comma in writing), i and it does not affect the propositional content of the messages conveyed in the segments of the discourse.
The discourse-functional expressions in language have long been the focus of attention on the part of scholars, and the term “discourse markers” (DMs) (huayu biaoji, in Chinese) has often been used in previous studies. The concept of DMs originated from “recurrent modifiers,” the common modifiers in spoken language proposed by the British linguist Randolph Quirk in the 1950s. He pointed out that “recurrent modifiers” have an important role in information transmission but have no grammatical effect. In the 1980s, DMs gradually became an independent linguistic topic among Western scholars. In the field of Chinese linguistics, from the 21st century onward, the concept of DMs has been examined in depth, and the application of the related theories to the research of Chinese DMs has been the topic of widespread discussion. However, most Chinese studies on DMs are case-based, and therefore systematic and theorized understandings of Chinese DMs have not yet been reached. This article reviews the research status of DMs in recent Western and Chinese linguistic communities, summarizes the studies on the synchronic semantics-pragmatics and diachronic development of Chinese DMs, and reveals issues worthy of further study in the future.
