It is beyond challenge that tense occupies a crucial position in English grammar, but little has been achieved about its cohesive function in text.
时态在英语语法中的重要性是无可置疑的，但是从篇章学的角度来分析时态的语篇衔接功能的研究还很少。
Tense and aspect are two important categories of the verb, and they were not separated in traditional grammar.
时和体是动词的两个重要范畴，在传统语法中两者并不区分。
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