It is +段时间+since+主语+did.请比较:It was +段时间+since+主语+had done.如:It is five years since he left here.他已经离开这儿五年了.It was five years since he left here.(同上) 请问第二句不是应该用it

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It is +段时间+since+主语+did.请比较:It was +段时间+since+主语+had done.如:It is five years since he left here.他已经离开这儿五年了.It was five years since he left here.(同上) 请问第二句不是应该用it 有没有it is been+段时间+since和it was be+段时间+before这种表达? It is/was +段时间 +连词(since/before)+一般现在时,一般过去It is/was +段时间 +连词(since/before)+一般现在时,一般过去时,或完成时.请哪位懂的讲一下,关于连词的固定句型 It is+段时间+since sb did.这是翻译成 自从不做.多久了 那么自从做.多久了 应怎么翻译It is not+段时间 before sb did 怎么翻译 It is+时间段+since+时间点.可以说一个例句吗? It is / has been + 段时间 + since + 一般过去时,从句中的动词用延续性动词和非延续性动词有何不同请详解并举例说明,谢谢 有没有it was +时间 since ...大家一定知道有It is +时间 since .请问有没有 it was +时间 since.如果有,请问it was 后面加什么?since后面加什么? it has been +长度时间+ since+主语+谓语+宾语这里的谓语是过去式还是过去分词? 英语翻译it is/was 一段时间 +beforeit is/was 时间点 +whenit is/was 一段时间+ since 英语:it was+段时间+before结构是什么意思? It is+时间段+since+时间点那It's 9 o'clock 是时间段还是时间点 It's+时间段+since+主语+?It's+时间段+since+主语 后面的动词是要用一般过去时还是现在完成时? it is 时间段since从句和it has been时间since从句的区别嗯……急用……可以等同么麻烦各位了…… it is 时间段since从句和it has been时间since从句的区别两者可以互相转换吗,英语专业人士来. 英语代指是怎么表现的 比如it代指时间:It is ten years since I left Beijing. It has been a long time since i saw you last time.这句话的形式主语是it?那么它的真正主语是什么?如:It is a long time between 1900 to 2012.这句话的形式主语是it,真正主语是betweem 1900 to 2012.Between 1900 to 2012 is 英语中for+段时间,since+点时间,怎样区分点,段时间?要详细 Since 接段时间要用ago吗