看两个英语句子.It is three years since he was a teacher.他不当老师有三年了.I

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看两个英语句子.
It is three years since he was a teacher.
他不当老师有三年了.
It is five years since he joined the Party.
自从他入党有五年了.
这两个句子的形式完全一样,但为什么第二个不翻译成“他不入党已经5年了”?以及到底何时要翻译为肯定,何时翻译为否定?

1.since 后如果跟延续性动词,就翻译成 “自从……结束以来,已经有……年了”,译为否定,即第一句 It is three years since he was a teacher. 他不当老师有三年了.句中的 was （be）为延续性动词.如：live,study,keep,have,learn,know 等,都是延续性动词.
2.如果since 后跟短暂性动词,就翻译成“自从……以来,已经有……年了”,译为肯定,即第二句 It is five years since he joined the Party. 自从他入党有五年了. 句中的join 为短暂性动词.如come, go,start,begin,get,buy, leave等都是短暂性动词.
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看两个英语句子.It is three years since he was a teacher.他不当老师有三年了.I 英语翻译it is already three years since he was a teacher是他不当教师已经 It _____ three years since he _____ the computer这台电脑他已经买三年了 It is three years since he smoked. 英语翻译她离开班级已有三年。这好像是关于since的语法例如：it was three years since he 英语翻译It is five years since he became a soldier.他当兵已经五年了.It i dong英语的进来1\It ___ten years since he ____here.A.is;left B.was It is three years since he worked there.如何翻译.为什么有一种翻译是：他不在那儿 It's three years since he was married .的翻译 "It has been ten years since he was a teacher."这句话有什么错误?可以怎么解释两个句子It was five years since I lerned English.和It was five It is three years since he became a worker 用现在完成时改写