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广义的情态范畴不仅指具有形态表现的各种语气（如直陈的、虚拟的或祈使的），还指不同的句子类型（如陈述句、疑问句和命令句等）。狭义的情态主要是用来指说话人对所述内容的态度。Lyo
s1977452认为，情态是句中的命题以外的成分或修饰命题的成分，是说话人对句子所表达的命题或命题所描写的情景的观点或态度，也就是说，情态是指语句中的非事实性
o
factuality成分。Palmer（1986：51125）详细讨论了两类情态：知识情态（epistemicmodallity）和义务情态deo
ticmodality两者都涉及主观性与非事实性，知识情态涉及说话者对命题的信仰、知识、真实性的态度和观点，而义务情态涉
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