义务情态 deontic modality
In addition to these subjective uses, there is also an objective category of deontic modality, which merely predicates the existence of some necessity without actually committing the speaker to it.
还有些义务情态不表达说话者的态度,而仅仅说明某一必要性的现实存在,呈客观性。
参考来源 - 英语情态助动词的主客观区别·2,447,543篇论文数据,部分数据来源于NoteExpress
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