The Modal Verb 情态动词
must modal verb 必须 ; 应该
Modal Verb Series 情态动词连用
Hilfs-und modal verb 助动词和情态动词
Auxiliary Verb and Modal Verb 助动词和情态动词
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
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.
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。
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。
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