This paper takes"moruo(莫 若)"as an example to investigate the evolution from choice marker to discourse marker."moruo(莫若)"has undergone an evolution process of"subject-predicate phrase＞verb＞choice marker＞discourse marker".Its discourse marker function formed in the Ming Dynasty,helping the speaker to mark subjective inferences and make suggestions.Additionally,"buru(不 如)"in ancient Chinese,and"yaobu()""buran(不然)""haishi(还是)""deshi(的是)""dehao(的好)"in modern Chinese have also evolved from choice markers to discourse markers.It can be seen that"choice marker＞discourse marker"is a recurring evolutionary pattern in Chinese,and its causes are closely related to the principles of economy,politeness,and temporal sequence.
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