English tense system has always been one of the main subjects for linguists and grammarians.
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。
In the selection of English tenses, the tense system is first determined and then the norm of the system with other tenses chosen in relation to the norm.
英语时态的选用，一般先选用时态系统，再选用规范时态，然后根据需要选用其他时态。
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