1、看到这样两句句子：You will have reached Shanghai by this time tomor

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1、看到这样两句句子：You will have reached Shanghai by this time tomorrow.可将来进行时的标志词有by this time tomorrow.这到底是怎么回事?
2、Before long he will have forgotten all about the matter.Before long不是=soon吗?怎么会用将来完成时?虽说before+将来时间是用将来完成时,可Before long是个固定短语啊?
感谢大家的回答↖(^ω^)↗

1、没有怎么回事 by this time tomorrow就是将来的一个时间不是一定是进行时的完成时还是进行时是取决你想说什么的呀
意思是【明天这时候你就到上海了】（如果硬抠的话可以说【明天这时候你会处于“已经到上海了”这个状态的】）
反正就是到将来某个时刻某事会被完成了、会处于“完成了”的状态了
2、Before long=soon可以这样说不过替换进去也是成立的
soon he will have forgotten all about the matter.
soon也是表示“将来”“不久之后”嘛用将来时没有问题呀
我觉得你是不是太抠【标志性短语】这回事儿了有标志性短语说明很可能要用某种时态但也没有那么绝对的总的来说还是要看你想说什么话、语言就是表达交流用的嘛
再说也不是没有标志性短语就不能用某种时态了标志性短语不过是一种很好的提示不要陷入这种死板的系统里去

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