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。机能情态总是客观的，可以出现在条件句中；