The conjectural modal adverbs, all of which amount to seventeen in the total seventy-seven adverbs that each can constitute a sentence by themselves in modern Chinese, are possessed of such semantical characteristics as [+conjecturalization], [+uncertainty]as well as [±truth-conclusion ]. In the process of intercommunicating, the subjectivity of conjectural modal adverb is highlighted by its flexible perspectives, the abilities to express subjective emotions and cognitive moods. Its subjectivisation is achieved by means of the transformation from propositional functio...