然而， 情态动词一直是英语语法中的一个难点，各语法流派在对其意义和语法范畴的描述中存在分歧。
However, modal verb remains to be a problematic area in English grammar due to the discrepancies lying in the description of its meanings and even its grammatical categories.
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.
情态助动词输入的是处理信息，它表示句子其它部分输入的概念信息与语境中系列假设之间的关系。
Modal auxiliaries provide procedural information that indicates the relation between the conceptual information provided by the rest of the sentence and the assumptions in the context.
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