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I think that both are correct, but what's the difference?
It hasn't happened yet. It's all in the future.
Before you find out what happened I'll have known about it for a
Before you find out what has happened I'll have known about it
for a few hours.
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asked Oct 26, 2022 at 7:07
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The second implies that the 'happening' was very recent, or is expected to happen soon. British English speakers use the present perfect in this way more often than Americans.
answered Oct 26, 2022 at 7:39
Kate BuntingKate Bunting
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