"Gaobuhao"(搞不好)is a resultative complement structure that is active in spoken Chinese and has gradually grammaticalized into an adverb indicating speculation.Over the years,the academic community has made fruitful research achievements in the syntactic dis-tribution characteristics,semantic modalities,diachronic evolution,and other aspects of the adverb"Gaobuhao".However,there are still issues such as insufficient precision in descri-bing syntactic distribution,lack of positive and negative verification of semantic modalities,and lack of systematic explanations.Guided by semantic grammar theory,this article sum-marizes the discourse association of the adverb"Gaobuhao"as"inferring outcomes from situa-tions"in the order from syntactic distribution characteristics to discourse association and then to se-mantic modalities.It attempts to positively and negatively verify the modalities of"concern"and"optimism"associated with the adverb"Gaobuhao",aiming to address the aforementioned issues.
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