...态动词can可以用may/might替换，故其只是表示一种认知情态(epistemic modality)，即一种可能性，而不能反应根情态(root modality)，即不能表示履行实际行为潜在施事的能力。
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本文也指出根情态动词与认知情态动词的差异是由句法因素决定的。
We also argue that the distinction of epistemic and root modal verbs reflects a syntactic difference.
对于情态隐喻而言，它是语言行为情态的全面体现，语言行为情态贯穿于根情态向认识情态、情态隐喻拓展的过程。
In epistemic modality, assertives are the main performatives. And speech acts co-occur with metaphor of modality. So speech acts come with modality.
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