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。
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。
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。
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