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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