英语语法教学中时态的教学是一个难点。
The tense teaching is a difficult point in English grammar teaching.
第二部分是概述时态作为语法范畴的研究。
The second part is a review of the studies on tense as a grammatical category.
英语时态系统一直是语言学家和语法学家研究的主要对象之一。
English tense system has always been one of the main subjects for linguists and grammarians.
英语时态，特别是过去时的探讨和研究一直是传统的语法学家的探究热点。
English tenses, especially past tense, is always a hot issue of the traditional grammarians.
英语时态，特别是过去时的探讨和研究一直是传统的语法学家的探究热点。
English tenses, especially past tense, is always a hot issue of the traditional grammarians.
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