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No sooner...than, Hardly...when
If the second event occurs immediately after the first, we can express that idea using the structure no sooner … than.
Note that in this structure no sooner introduces the event that occurred first.
No sooner had I arrived at the station than the train came. (= I came first and the train arrived right after me.)
No sooner had we heard the noise than we rushed to the spot.
No sooner had she finished...
Present Perfect Simple
https://vichhaiy.wordpress.com/2015/07/07/present-perfect-simp...