إِنْ دَرَسْتَ نَجَحْتَ.
Translation: If you study, you will succeed.
Both verbs are past-tense and indeclinable, so there is no visible jussive change; the conditional construction still exists.
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Two Past Verbs: No Visible Jussive
The Jussive Imperfect: Governors, Conditions, and Request Responses
إِنْ دَرَسْتَ نَجَحْتَ.
Translation: If you study, you will succeed.
Both verbs are past-tense and indeclinable, so there is no visible jussive change; the conditional construction still exists.