Sufficient research on the case study on modal verbs will help discovery the inner principle of the usage of this verb category.
对情态动词进行充分的个案研究，有助于该类词的内在规律的揭示。
Therefore, it is not only possible to query for individual categories (noun, verb), but also category groups (word, phrase).
因此，不仅可以查询单个的类别(noun, verb)，还可以查询类别组(word, phrase)。
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