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.
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.
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