I will go as soon as I have finished my lesson.这里的从句为什么要用现在完成时而不用原形?

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IwillgoassoonasIhavefinishedmylesson.这里的从句为什么要用现在完成时而不用原形?IwillgoassoonasIhavefinishedmylesson.这里的从句

I will go as soon as I have finished my lesson.这里的从句为什么要用现在完成时而不用原形?
I will go as soon as I have finished my lesson.这里的从句为什么要用现在完成时而不用原形?

I will go as soon as I have finished my lesson.这里的从句为什么要用现在完成时而不用原形?
用as soon as I have finished my lesson和as soon as I finish my lesson两者都可以的.

在这里用现在完成时来表示一种假设,而不是一般的事实。

这是将来完成时