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I read this,

We won’t know if it’s a true antidote until they’ve had a chance to study it.

But I find other examples are more tend to present tense,

You won't know until you try.

Why?

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  • Both of those sentences use exactly the same tense for the phrase: won't know. Also, won't (or will not) is future tense, not present tense. – Jason Bassford Jul 12 '19 at 13:39
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    @JasonBassford Apparently, they mean the until part: the present perfect of they've had vs the present simple of you try. As far as I know, the present perfect simply puts the clause in the past relative to the future of the main clause. You might call it "past-in-the-future." The present simple puts the clause in the same future as the main clause. – athlonusm Jul 12 '19 at 18:23

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