一道语法题By the time you get to shanghai tomorrow,I_for chongqing.By the time you get to shanghai tomorrow,I_for chongqing.为什么选择shall have left 而不是选择will leave?希望把知识点说详细是虚拟还是条件还是

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一道语法题Bythetimeyougettoshanghaitomorrow,I_____forchongqing.Bythetimeyougettoshanghaitomorrow,I_____fo

一道语法题By the time you get to shanghai tomorrow,I_____for chongqing.By the time you get to shanghai tomorrow,I_____for chongqing.为什么选择shall have left 而不是选择will leave?希望把知识点说详细是虚拟还是条件还是
一道语法题By the time you get to shanghai tomorrow,I_____for chongqing.
By the time you get to shanghai tomorrow,I_____for chongqing.
为什么选择shall have left 而不是选择will leave?
希望把知识点说详细是虚拟还是条件还是将来完成时.

一道语法题By the time you get to shanghai tomorrow,I_____for chongqing.By the time you get to shanghai tomorrow,I_____for chongqing.为什么选择shall have left 而不是选择will leave?希望把知识点说详细是虚拟还是条件还是
因为by the time 的出现意味着使用完成时态而不是一般将来时态,而shall have在整句话中可理解为：当你明天这个时候抵达上海时,我也将在那时已经（shall have）抵达重庆.人已到了而不是will 所表达的“将出发而未到（重庆）”.

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如果只是在shall have left 和will leave之间选择，考查的是时态，就是一般将来时和将来完成时。will do表示一般将来时，意思是打算或者准备将来做某事（还没有做）。shall have done表示将来完成时，意思是在将来的某个时间点之前，已经完成某事（某时间点之前已经做）。
By the time you get to shanghai tomorrow,I shall have left for chongqing. 意思是：明天你到达上海之前，我将已经前往重庆。在“你到上海”这个时间点“之前”，我“已经”前往重庆，有了“已经”，还是将来的情况，所以选择shall have left 这个将来完成时。
虚拟语气，很好理解，就是表示的内容并不是真实的，If she were not ill, she could do a lot of things.意思是：如果她没生病，她能做许多事情。“她没生病”是不真实的，实际她病了。而你的题目中，将前往重庆，是要真实发生的。
从句意可以看出，我前往重庆和你到上海之间，并不存在条件的关系，也没有引导条件主语从句的连词或者词组，所以也不是条件主语从句。
这句主要考察一般将来时和将来完成时，就看动作是否在将来时间已经完成。

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一道语法题By the time you get to shanghai tomorrow,I_____for chongqing.By the time you get to shanghai tomorrow,I_____for chongqing.为什么选择shall have left 而不是选择will leave?希望把知识点说详细是虚拟还是条件还是求解一道sat 语法改错题by the time the bank guard closed the doors,a riot had erupted due to the long lines and shortage of tellers.为什么这里要把DUE TO 改成 AS A RESULT OF 一道简单语法题The sculptures of Michael Kapetan function as sundials,kept time by casting shadows that show the path of the sun.哪里错了,为什么,怎么改 when i saw you first time i was attractive by you.语法错了对吧.?上面那句错了..对吗?是不是可以换成when i saw you at the first time i was attractived by you . by the time ,by then B--- will be ready by the time you have dressed. B_____ will be ready by the time you have dressed. You can know the time by watch or c By the time by the time 求大师详解：by that time,by then,by the time都有“到时候”的意思,具体含义和语法上该怎么分辨呢? 一道有关定语从句的高中英语题The Greens will move into the new house next Monday,( )it will be completely finished.A.by the time B.by which time C.by that time D.by this time括号中应选择哪个选项?为什么?这道题在考察什 by the time 和 as soon as 区别?有这么一道题：Did you catch the first bus this morning?No.It had left the stop ____ I got there.the time ,但为什么as soon as 不行呢?二者的区别有是什么? 一道四级语法题“You are very selfish.It’s high time you ______ that you are not the most important person in the world,” Edgar said to his boss angrily.A) realized B) have realized C) realized D) should realize并说明原因英语冠词语法题by the time he was 38,he had become principal of a university.其中,为什么principal 前面没有冠词? You can choose the time whenever you like 这句话的语法对吗? What the time by you watch 这局话的中文意思?为什么用by? i want to retire by the time i'm thirty.请分析语法结构我不懂为什么不是by the time when i'm thirty.而是by the time i'm thirty.