Modal verb is a comparatively weak point in Chinese research as well as a hard point to foreign students who learn Chinese as a second language.
能愿动词(助动词)是留学生学习汉语的难点，也是汉语研究中相对薄弱的一环。
参考来源 - 对外汉语教学中的能愿动词偏误分析·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
The semantics and the use of the English modal verb in the present tense are very complicated.
英语情态动词现在时态的语义和用法十分复杂。
According to the semantic characteristics, verbs can be classified into action verb, state verb, relation verb and modal verb.
按语义特征将其分为动作动词、状态动词、关系动词和能愿动词四类。
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。
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