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请高人详解这个语法It has been ...(time) since sb.+一般过去时 和 it has been

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请高人详解这个语法
It has been ...(time) since sb.+一般过去时 和 it has been...(time) since sb.+现在完成时 意义和用法有什么区别?分别用于瞬间动词和延续动词时有什么区别（大概是2×2=4种情况吧?附例句
请高人详解这个语法It has been ...(time) since sb.+一般过去时 和 it has been
现在完成时 since 过去时间点
表示自从过去的那个时间点到现在怎么怎么样
至于说瞬间动词和持续性动词,since加瞬间动词即动作的发生时间,加持续性动词即动作结束的时间.
举例：its been 30 hours since i woke up和 its been 30 hours since i slept.都是同样的意思,我起床（睡完觉）已经30小时
重新修改一下,it has been...(time) since sb.+现在完成时 是指自从sb动作开始以后怎么怎么样
再问： 它跟正译和反译有关的！请解释是自从我做某事还是自从我不做某事
再答： 我觉得这里不一定要反译，直译也可 如果一定要反译的话，上面的句子，译作我已经30小时没睡觉了
再问： 请分一下类。1.完成时+瞬时动词。2.完成时+延续动词。3.。。。4.。。。分别是直译反译还是怎么译？并举个例子。谢了。会加悬赏的
再答： 都可以正译和反译，具体你要考虑中文语言习惯和上下文 1.since last time he participate 正译：自从上次他参与……，已经；反译：他不来参加已经…… 2.since he ate 正：自从他上次吃饭已经；反：他已经……没吃了 另外说到since后面跟完成时，只跟持续性动词，指动作开始的时间，如果是瞬间动词的话，直接就用过去时来表示即可。 比如 since i have lived here，自从我开始在这里居住，这里估计用不着反译 另外since i have tried一般不会用，可以直接since i tried 如果since表示原因、条件的话那就另外一回事了
It is/has been + since sb + it has been some time+since是什么意思 it has been since.用法 It is/has been+since sb+did 怎么用? It's a long time since还是It has been a long time since it is some time since+...与it has been some time since+...什么区 为啥it is some time since与it has been some time since没区别 it has since been rebuilt怎么翻译 造句it has been +时间段+since从句 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 It has been a long time since anything as good as you has ha it has been a long time since+?since后面加什么形式?